FTC registration for events is done on a state level, and not directly through FIRST, except for Split Championships (Worlds). Contact your state Affiliate Partners. Your should be getting emails or communication from them already on the season. If not, Look below for your area.
Los Angeles
Partner
Gigi Johnson
community@socalftc.com
Northern
Partner
Mark Edelman
ftc@playingatlearning.org
http://www.norcalftc.org/
San Diego
Partner
John Brooks
ftcsandiego@att.net