You can add your existing Terms and Conditions webpage to the registration process so customers are required to agree when they sign up.
Copy the URL from your Terms and Conditions page
Click on the name of your organization on the top right
Select Business Settings
In the Link to Checkout Terms field, add the URL from your Terms and Conditions page
When customers register, they will be required to check a box to agree to your Policies/Terms & Waivers and have the option of clicking a link to read them
If you would prefer that the terms themselves are automatically displayed without customers clicking a link to a new page, you can build your waiver right into the registration process by creating custom form fields.