Themes [SOLVED]

After you install new Themes, how to use them?
Or at least how I can change bottom panel from transparent to any normal color? My friends and I realy don’t like it :frowning:
It’s just because of picture with goes under and you can’t normally see anything.

System Settings - Workspace Appearance - Desktop Theme

Ok after I installed like 10 of them, they appeared near the old ones. Thanks.
But still not all of them, maybe some of them is buggy or something.

where did you get themes?