Where can I go to appeal a TF2OP ban the link does not work.

Says it all in the title!

First you need to be in the TF2Outpost Group.
http://steamcommunity.com/groups/tf2outpost

Second of all you need to read this:
http://steamcommunity.com/groups/tf2outpost/discussions/0/558747922562007365/#c540742485382216907

You have to be in the TF2OP Steam Group in order to have access to view all of their forums. To appeal your ban, you need to create a ticket on the site.

The Link SteamRep has on their site to the Appeals is correct, but in order to see it you have to be in the TF2OP group.

i've added a additional note to that part of the how-to: http://forums.steamrep.com/threads/howto-appeal-banned-and-caution-reputation-tags.58/