>>>Just to be clear, I want to UNsubscribe to the Reliion forum, not add it. I still don't get it.
>>
>>Category filter means filtering the category. So, once added, it will no longer appear.
>
>OK, hopefully I succeeded. I find the page very confusing, you have to be a mind reader to understand it. See attachment, it needs some informative text.

I agree. It isn't intuitive at all. It does work though.