The registration waiver text can be found in the campaign dictionary.
1) Go to campaigns admin panel.
2) Click on the Settings tab and Campaign Dictionary tab under it.
3) Find the "Various - Waiver for RSVP / Full Registration" item in the list.
4) Click on the item to make a change.
5) Click the Edit button on the pop-up.
6) Make the necessary changes and click Save button.
The changes will be displayed the next time someone uses the registration process.