To change your password, go to the "Edit Account" tab, as pictured below.

Navigate to the area labeled "Password." On the right side, you will see a link that says "Click to Change Password." Click it, as pictured below.

The menu will expand, and a password changing area will appear. Enter you current password, and your new password twice. When you are complete, press enter, or click "Save Account Information."

Make sure your password has a minimum length of 5, and that you type your new password correctly both times. You will see an error message otherwise.