Customizing Business Features theme or services

Hello ,...

Regarding the customizing of the themes Business features or even services, I am totally confused.

I thought I am experienced with WP, ... I am with woothemes, Pagelines and WP for years already.

But,... I can not find any passibility to ustomize above Themes exept aproxx. 10 css colours unter Customize..

Are there any funktions, which I can not see, I s the Installation wrong?

I also choosed default.css, but no effekt in customizing...

Under "edit" I even can not find any stylesheet called default.css

At the moment i can`t find anything to design a proper page,...

By the way,... is it related to creating a Child Theme, what I did not do ,yet?

Sorry ,... I am running mad at the moment,... I can not understand the whole Concept of the first wpmudev Themes above...

Please help,...

Jörg