If you're using our Custom Header feature, than you can pretty easily change the Site Name and the Tagline of your site!

We've written separate FAQs for each of these actions:

How do I change the Site Name (i.e. _____'s Xanga Site)?
http://help.xanga.com/howdoichangesitename.htm

How do I change my Tagline?
http://help.xanga.com/howdoichangetagline.htm

If you're looking to get fancy and add your own fancy customized HTML to your Header... then you'll want this more advanced FAQ:

How do I get the HTML for my own customized Header?http://help.xanga.com/htmlcustomizedheader.htm