Ok, I did a Concrete5 website a few years ago and it was simple because I went through Bluehost. I started a site with hostgator and wanted to come back to Concrete5, but I am still a super newbie and just do not really understand the whole writing a website thing. I am signed in to Concrete5 and it has my old website under "projects". I am looking to use a theme and edit the theme and use it for my site with Hostgator. I have no idea how to edit the theme I want and then put it up on my site...

I will need a very basic step by step tutorial. As I do not understand ANYTHING, think of me as someone who has never been online and is wanting to have a simple website...

Please help?
Thank you!