If you can still sign into your account, then it will become active when you start posting to it. So to undelete or reactive your site... just start using it again!

If you cannot sign into your account, and it says your site has been shut down, then the best thing to do is to start a new site.  You can do that by going here:

• http://www.xanga.com/register.aspx

To check if your site has been shut down, go here:

• http://help.xanga.com/checkshutdown.htm