You can change the default branding of the user portal page using the Branding option on Administration Console Dashboard. For more information, see Section 7.8, Changing the Branding of the User Portal Page.
To perform complex customization, you can edit the JSP file.
For information about Identity Server customization, see Section 4.1.3, Customizing Identity Server.
For information about Access Gateway customization, see Section 4.2.9, Customizing Access Gateway.