Setting sustained loops in JJ3.16 - where is the lock icon?

Am I trippin cuz Ive been using JJ for a while but now Im reaching for that lock/unlock icon in TRIM and dont see it. I want the sample to play from start, then loop from the middle of the sample.

Haven't got my mpc yet, (waiting to pick it up in the states) but have been reading MPC tutors beatmaking manual and think this might be your answer:

In the TRIM mode, once you've selected your loop start point, hit "window" and you should be able to change Loop Point=start point from Yes to No, then change the sample start point to 0.

Hope this helps.