How do I get my site to look just like the demo?

Alright, here’s the deal. I don’t know anything about creating a website. I’m hosting on ipage, and I installed wordpress and purchase the Revitas theme. I was under the impression that it was a “drag and drop” theme which I was ensured meant, that it would just show up and I could just change the dummy text with my text and change the pictures with my pictures, etc. It says I have the theme installed on my wordpress dashboard, but I can’t get the website to look ANYTHING like the theme demo….I have no idea what to do, nothing makes sense at all…and I was promised that this was supposed to be easy.

I was thinking it would be like wix or Squarespace where you just exchanged everything for your content.

HELP!