how to edit my theme

I can not figure out how to edit my theme. wordpress is different from what I am used to seeing and I can not figure out how to do anything with my pages it is to confusing now. my site is at https://www.fanddhomeservices.com I need to get some content on there. The only thing I was able to figure out was to put in my logo which does not look right. any help would be appreciated.

Denise