The numbers stand for the amount of specific gender of that species they keep. For example, 1.2.3 would mean you have 1 male, 2 females and 3 unsexed. To edit your signature, you'll have to go to your control panel. If you look in the upper left hand side of your screen (scroll all the way up) you will see a tag called "User CP". This is your control panel and you can edit your signature and all sorts of other stuff from here.
AKedit: Beaten to it!
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