How do I change themes?

[v.con]

I cannot change themes

I am on cm 12 nightly and should be able to load themes but cannot

 

[Rukbat]

Re: I cannot change themes

Only themes designed to work with the launcher you're using.

 

[v.con]

Re: I cannot change themes

I have no way to get into themes. No themes in settings. Cm 12 supposedly put an engine into their nightlys but for some reason it is not showing up.