Unable to edit theme/ set up pages

Hello!
So unfortunately I know nothing about setting up a website, but I believe I've figured it out up to the point where Grawlix is installed on my webhost (DreamHost). The only problem is I think something went wrong (or somehow I missed a step) during the installation process because I cannot figure out how to edit my site in terms of theme, or adding pages.

I know this is probably the most obvious thing, but it's very new to me so please bear with me!

This may be a little unclear right now, so let me know if you need more information.

Thanks!