Xanga Question

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I have a xanga account, but I'm not that active... I use it to keep in touch with my sister and some friends who live far away. My question is, I set my profile to private (so only friends can view), but as I did so I was warned that that any users who have already subscribed will still be able to view my profile. Does anyone here know HOW to cancel another users subscription to my profile? I couldn't find it anywhere on the site. Thanks!