If there are other members in your blogring, you should be able to transfer leadership in most cases.  Please see:

How do I transfer leadership of a blogring?
http://help.xanga.com/transferblogringleadership.htm

If you can not transfer leadership, than there are two likely possibilities:

1. There are no other members of your blogring

2. The other members of your blogring have chosen to opt-out of accepting the leader.

For more information on opting out of leadership, please see:

I don't ever want to be leader... how do I make sure leadership is never transferred to me?
http://help.xanga.com/howoptoutleadership.htm