Log into ftp, go to the root directory, find the first page that you want people to see and rename it "index". So if it's a html file it'll be index.html, if it's php it'll be index.php, etc.
i cant figure it out, when my wife first set this up she just created the account, then one of her friends fixed the website and then it said 403. no we cant get a hold of them and now we are screwed. whats my root directory?
Just look in File Manager. If you cannot find an index file, just look at any .html file, and from the links you can probably figure out what your friends meant to be the main page.