I cant figure it out where do I change the passwords for my accounts created .. do you guys know where is it ?

If when viewing your accounts you click on the "wrench" image it well open up a window to their site manager. You then simply navigate to:
Site Management > Site Parameters and you can change it there. It is a bit confusing. I kept thinking there should be a way to do it via clicking on the name of account and the options you have there but you can't. If you do click on the name on the first screen you also have the "wrench" image you can use to get to their site manager.