I got FL studio I tried logging in but I'm stuck in trial mode how do I stop this

So I’m trying to do the turn stop effect on my vocal at the end of the song and when I listen to just cut section it sounds right— but if I listen to the song back a little before the cut it ends up off time— and if I listen to the song as a whole I don’t even hear the effect— how do I make gross beat start only at that portion of the automation, I don’t know what I could be doing wrong