MyBB Community Forums

Good afternoon everyone, I've been clear that I'm a problem with my forum.
The problem is this, I installed a theme that is, I have uploaded, and clicked to force all users.
And when he logs out, it appears the basic theme of MyBB.
Does anyone know how to fix this?

Admincp -> Templates & Style -> Themes -> Your Theme -> [Options] -> Set As Default

Thank you!