You can reset your current password on Sign In page by clicking to the "Forgot password?" link.
Then, you have to insert your email address in Reset Your Password form and click on the "Send Instructions" button.
You will receive password reset instructions to your email within 24 hours.
If you want to change your current password, please use the corresponding form on the Profile menu page.
To do this, insert your current password, then set a new one, and repeat the new password once again.
Please note that password minimum length is 6 characters, including 1 uppercase and 1 number, you can also use only the following characters for your password: A-Z, a-z, 0-9.