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Is it possible to edit the tags on a thread you've created?
I believe you should be able to click on "Add/Edit Tags", to remove or add new tags of yours.
I forgot tags existed. People rarely use them and browsing the forums by tags is even rarer, so don't worry about it.
But yes, just the Add / Edit Tags button near the bottom of the page.
Thank you, everyone, for your help! ^_^