Spam filter and Mark as span button in Round Cube

I am trying to setup my Round Cube. Could you help me to setup spam folder and to add a button mark as spam?..
I couldn't find any documentation about it related to CWP.
Thank you.

I think I found a solution.
You should add mark_as_junk plugin in your roundcube configuration. Plugin already installed, you have just to add it in the roundcube config.