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Go to the profile of a kitty you own, and simply click on it's name (which by default is Kitty#XXXXXX). Now just type in the new name and click on enter, and it's all set.

So simple, that's probably why I didn't get it. LOL
Your the best :-)
Merry Christmas

Hehe, yeah, it's actually very easy ;)

Merry Christmas to you and your kitties as well!