Under the Publisher Terms in your Settings, you can upload, change and manage your very own Terms and Conditions.
These T&C's are used and displayed during the Sign Up Process of your publishers for the Publisher Interface.
Every publisher agrees to these T&Cs of yours, while they are signing up.
You can set if the T&C's are required or not.
If yes, you can upload your own T&C's and change them whenever you need.