first time using a t/c lockup on the track

so i have used a lock up in the past just never used it on the track my question is how to use it i now have a built trans that will hold it but my question is do i lock it after i do my burnout and will it lock once i hit 2nd gear or how do i need to do it after i launch? any help will help alot cause im heading to the track tonight

the truck im running is a 99 cummins with a smarty and ts pm3 stack a 63/68 turbo 6x18 injectors with a industrial hot rod vp and the trans has a billet flex a billet input and a full suncoast omega 3 race kit