[Monica]

For your avatar, you need to go to the top of this page, click on 'Quick Links', look down until you find 'Edit Avatar', and you should be able to fix an image as long as it's not too big.

As far as Alfalfa, you need to distract him with something else. Try getting him more toys, different toys, things he can play with. If he is chewing on something that he is not suppose to, firmly tell him 'No', then put him on his cage, or a playstand (if you have one) and make sure he has toys with him that are appropriate to play with.