Yes, it is very straight forward to change your password, email, telephone and more within the Quicklink Manager.
When logged into the Quicklink Manager, click by the account name in the to-left hand corner.
From the menu select My Account.
A Manage account popup will appear with all your Quicklink Manager information. From here you can change your email address and password, among more options.
To change your email, simply enter your new email address in the box where the old one is and then press save.
To change your password, in the change password section, type in your current password, then your new password in the two boxes underneath. Click save and your new password will be saved.