To subscribe to someone's Xanga site, look on their site for their Subscriptions list. It is usually on the left side of the page.

There should be two links at the top of the module:

Subscribe to littletimmy
Get trial subscription

(The top link will not always say "subscribe to littletimmy" - only if you are visiting littletimmy's weblog).

Clicking the top link will subscribe you to the weblog.