To change your password, do the following:

1. Click on "My Profile" at the top of the page (below the A3D icon). 
2. At the top of your profile, choose "Edit" --> "Update Your Profile".
3. Click on the "Contact Info" tab at the top.
4. Enter your password on the line marked "Password:".
5. Verify your password on the line marked "Verify Password:".
6. At the bottom, click on the "Update" button.