If you have any questions about the site, I might be able to help since I've been here for a while. If you want to know a few good groups to join, I can probably help there, too. I hope you enjoy being a member of dA!
Here's a good group I think you might like being a part of:
Just try clicking/tapping the icon up there and it should take you to their home page. Find the button on the home page that reads "join our group" to join them.