how do i change my profile picture? she i click on the blue cat it doesnt do anything please help me!!

You're close when you're clicking on the blue cat, but not there. What you have to do is go to your profile page, hover your mouse over the blue cat, click “Change”, then pick the new profile picture that you'd like.

By the way, welcome Halima13 to Scratch! This is a really great place to be, and I hope you'll find it that way as well. ;)

Welcomes,

ErnieParke