If I wanted to use a theme, can I use the content as well?

I finally got it working! Screen Shot 2017-03-09 at 4

How can I change the logo for example?

Check out the files in /user/themes/deliver/, it will be specified either in a template or as CSS.

I just installed Grav and it works. But I dont know how to install properly the skeleton for grav?? Please help

And also how to edit the skeleton?