Leaders have the ability to:

• edit blogring descriptions
• turn off auto-approval of members (and turn it back on!)
• approve members
• delete members

For more information on each, please see:

Can I edit the description of my blogring?
http://help.xanga.com/editblogringdescription.htm

How do I turn off auto-approval of new members, so that new members have to apply to join?
http://help.xanga.com/howturnoffautoapproval.htm

How do I approve members who have applied to join my blogring?
http://help.xanga.com/howdoiapprovemembers.htm

I'm a blogring leader... how do I delete other members?
http://help.xanga.com/howdeletemembers.htm