Alright here's a quick run through...
F light is for returning the truck back to stock
P1, P2, P3 are your three custom programs
plug X-cal 1 into truck and then press select button until the proper program light lights up and then hit the program button (with the key in the ON position). The lights will start flashing as its programming and when they stop and just the one light for the file you chose is lit up (about 4-5min) then you are good to go!
Hope this helps
Tyler