How to--Remove Myself from a Campaign?

Pretty much what the topic says. I'm a player of a Campaign that I'm done playing. I retired My character but I'm still getting info from forums from that game. How do I simply just kill the Campaign off of my list of Campaigns I'm playing?
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There is a link on the members page for that campaign called "Leave campaign". If that's not there, let me know and I'll take care of it for you.
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Thanks in advance but the link "Leave Campaign" is not there.
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