Go to it's "user info" and it's there :) I think if you can't see it, you can click on "add friend" and it'll say they already are and do you want to delete instead :)
Go to http://www.livejournal.com/friends/edit.bml (http://www.livejournal.com/friends/edit.bml) (also acessible from the main LJ Menu under Manage | Friends, click "Edit Friends"). Scroll down to "Your Friends", find the unwanted feed in that list, and check the "Delete?" checkbox in the right-hand column. Then scroll all the way down to the bottom and click the "Save Changes" button.
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I think if you can't see it, you can click on "add friend" and it'll say they already are and do you want to delete instead :)
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