How do I link the "terms and conditions" to those on my website?

You may follow the instructions provided on these guides to do so: 

Adding-a-License-Agreement-to-a-Form

Creating-a-Scrollable-Terms-and-Conditions

This is the widget that you can also use to add Terms and Conditions on your form: 

http://widgets.jotform.com/app/terms__conditions

I hope this helps. Let us know if you need any further assistance. Thank you.