It is quite easy to change your password if you still remember them. Just click your “Account” and choose “Change password” , input your old password and new password, and save.
If you forget your password, there are two ways for you to retrieve your password. The first one is to click "forgot my password", input your username/account and email address and we will send you instructions to change your password. The second one is to click "forgot my password" and retrieve your password by answering security questions.