How do I use additional move booster on mobile device?

Mike_Way

How do I use additional move booster on mobile device?  I have many that have been gifted to me, but cannot figure out how to use them.  In need of a few more moves if to get through level 993.

StuckInATree

I don't think you receive the actual booster which you can apply at will, I'm pretty sure the extra moves (if you have received them from a friend) get added automatically to whichever level you decide to play when you have them, can anyone else confirm?