what are the different jobs that each team must have somebody for at the competitions?
Safety captain, driver, human player, drive coach, mechanical fixer-upper people. I forgot to mention a mentor or two!
is there a runner that can go into the field area and the pit
Well, after each match you can bring your robot back so there isn’t really a need for one. During a match, noone is allowed to so I think the answer is no.
A “team captain” and “adult mentor” to sign certain paperwork for inspection, loaner parts, etc.
no like when you are waiting to go on to the field and a bolt is lose or you lost a nut for a bolt
Yes, people from the pits are allowed to wait with the drive team in queuing.
If you are in the que, yes. If during qualification matches and you are already on the field, no. If you are in the elims, you can call one 6 minute time-out but I wouldn’t waste that on a loose bolt but if there is something wrong that could affect the outcome of the match, it would be worth it.
Typical roles for a team at competition are:
There may be some overlap between these first three groups depending on team size
Drive Team - 2 drivers, coach (may be a mentor) and human player
Judge Ambassadors - someone should be in your pit at all times to talk to judges
Pit Crew - personnel to work on the robot between matches
Safety Captain - Likely one of the people in the above three groups because this person should be in the pits most of the time
Scouts/strategists - Watch matches and collect data on competing robots
A “runner” would normally be a member of the Drive Team or Pit Crew, this isn’t really a frequent enough occurrence at regionals to need a separate person.
Our cart has a tool chest on it for that reason. Basically any tool we could conceivable need to use for a problem that could be fixed within 10 minutes is in the tool chest so that way it goes to the field with us just in case we need them. I try to get a picture up if I can find one!
Driver Team with backups
Chairmans Presenting Team
Safety Captain
Strategists with a team of scouts
Battery Boy/Girl
Pit Boss who makes sure there is always someone in the pit to talk to judges
Ambassadors
Spirit People in the stands
Sometimes. I would recommend that the drive team have basic mechanical abilities to do those quick little fixes. Some regionals do allow people in queue, but many do not, because they would not have drive team badges (which queuers often check for.)
whats a battery boy/girl and what do they do
If the robot’s battery is not charged, the robot is useless. Whoever is in charge of batteries needs to make sure that they are charged/charging/not used if they’re not ready.
go it is there anybody else that should be in the pit and/or other team jobs
They would make sure the robot has a fresh battery, and record (assuming you label your batteries) which battery was used when. They also make sure the batteries make it back to the charger after being pulled from the robot.
You also should always have someone in the pit who knows the code and the control system very well.
Most other “jobs” depend on your team - do you have a mascot costume that needs to be worn? We have people whose job it is to go around and pass out buttons, as well. Another useful thing would be to assign one person (probably a parent or mentor) who makes sure that everyone is staying healthy by drinking enough water and eating meals. Speaking of meals, there needs to be someone to coordinate them (taking orders and money, placing the order, etc - figure out if your venue offers pre-ordered lunches and when the deadline is for them).
Press pass! I’m usually used by my team as a runner if we’re in queue. As well, I know electronics so during Elims I’m like a free pass in 
NEMO (non-engineering mentor organization) has a paper in the resource section “Jobs at the Competitions.”
http://www.firstnemo.org/resources.htm
It is an older paper, and we would welcome any suggestions for updating!
If you don’t have a toolbox on your cart, have a runner. You’ll probably regret it at least once this season if you don’t. Do not make this person part of your drive team (because they run away). They can wait with your team in most cases, they just can’t do it inside the arena. Most queue setups are at least relatively convenient about this, and the driver can always come over to grab something. This applies right up through quarterfinals.
In semifinals, you’ll still have some wait time between matches without timeouts–even in finals it’s around 2min. You can bring your pit in, however, so you don’t need a runner. Most venues allow 2-4 extra people in to help.
You can also have a media person. Most venues nowadays allow 1 person from each team in the current match to come in and take photos/video.