I wanted to change the template on our website http://www.halcyonadventure.com/ to twentyten.
It only seems to work with 3.0 so I decided to upgrade. I'm new to wordpress (someone else set up this site) so I'm panicking now I've completely stuffed it up and haven't a clue how to put it right.
I just get blank screens. The source code is just:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <HTML><HEAD> <META content="text/html; charset=utf-8" http-equiv=Content-Type></HEAD> <BODY></BODY></HTML>
and it's the same on /wp-admin/ and /wp-content/ pages.
How can i revert back to 2.9.2 please?