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Ok 11CUTTLEFISH11 (talk) 14:39, September 29, 2013 (UTC)
Your change to the page Herpo the Foul's Horcrux was determined to be unhelpful and has been reverted or removed. Please use the sandbox for any tests you want to do. Take a look at the welcome page if you would like to learn more about contributing to our encyclopedia. Thanks. -- 1337star (Drop me a line!) 20:39, September 29, 2013 (UTC)
You cannot add a page to a category by editing the category page itself. Instead, you need to directly edit the page you wish to categorize (your userpage, in this case), and add [[Category:Animagus users]] (for example) somewhere on the page, preferably at the bottom.
Also, creating self-gratifying categories such as 11CUTTLEFISH11 Lovers is generally frowned upon, and I would like to request that you do not do this in the future. Thanks! -- 1337star (Drop me a line!) 16:32, October 27, 2013 (UTC)