How do i change the gender of my avitar?

i wanted to make a animated yahoo thingy when i accedentallly made it a boy. how do i change it?How do i change the gender of my avitar?
If you have already chosen the gender of your avatar, you can click PREFERENCES in the top right hand side of the screen. That will bring you to a page with two options, one of them being able to change the gender of your avatar. You can click on that, and then you will have a female avatar. Good luck!