A lot of people seem to need help changing their passwords. Doing this will change your forum, classic, and blitz password!
I made 3 pictures to help figure out what to do.
In this first picture you will see you need to click profile.
(http://img130.imageshack.us/img130/9663/wsscrn1.png)
From there go to Modify Profile and hover your cursor over that and then click account settings.
(http://img683.imageshack.us/img683/623/wsscrn2.png)
(http://img132.imageshack.us/img132/8019/wsscrn3.png)
Now scroll down a bit and you will see that there is a box where you can choose your new password, you need to type it in 2 times. And your MUST type in your current password down near the bottom. I also marked in the orange box where you can answer a security question in-case your account for whatever reason is hacked, or you forget your password it is easier to remember it.