The permissions panel can be used to change the site owner username and password. On the Max and Shop packages it can also be used to create password-protected pages on your site (often called members’ areas) or create additional editor accounts with different editing rights.
To manage permissions, go into edit mode, click the Panels button on the toolbar, and click the Permissions button:
The permissions panel will then open in a new browser tab. Note that only the site owner account can access the permissions panel, and additional editor accounts do not have access.