that bit is a 'title' that upgrades as you post more. you can't remove it. it goes from Newborn Pup to like Adult Hamster and Hamster Addict etc. once you reach I think it's like 1010 posts, you are allowed to ask for it to be changed or deleted if you so wish.
The hamster pup, adult hamster etc titles depend on the number of times you have posted as Cathface said. It changes as you do more posts until you can pick your own
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Proud mummy of Fluffy
I started off with one hammy...but one is never enough