Chassis Stiffener Angle

We were just wondering where the chassis stiffener angle goes on the frame of the robot. The chassis stiffener angle’s Dwg No & Rev is KITBOT-STIFFENER RevE. Also, the part of the chassis stiffener angle with holes in it is 1.7990 inches while the other part is 1 in. If anyone could post some links to some helpful diagrams or videos that would be greatly appreciated. If you would rather explain it that is fine too. Thanks for all the help.