If you are logged in, you can change your password from your profile. Click your name in the the upper right corner, and select "Profile" from the menu.
In "Profile" page, choose "Change password". Fill in your current password and then your new password twice. The password must have at least 8 characters, including lowercase and uppercase letters and numbers.
If you have forgotten your password and cannot login, click the "Forgot password" link on the log in page. For more information, read this article: 1.1.1 Signing in
If you have difficulties logging in, contact your administrator or our customer service at email@example.com.