Tutorial
From the MemberGate Control Panel
1. Under 'Master Settings' choose 'Edit Site Descriptions'

2. There are four fields to edit:
Long Copyright Phrase (non SSL)
Long Copyright Phrase - SSL - This will be shown on secure pages like the subscription form pages.
Long Copyright Phrase - Printer Friendly - This will be shown on printer friendly pages
Short Copyright Phrase

3. Press the 'Apply Changes' button at the bottom of the page