To add Store wide Terms and Conditions that are agreed upon checkout:
- Once in the CMS, select eCommerce on the left hand menu
- Under Display Options, click on T&C
- Add your text and click green Save Changes button at the bottom.
- Publish.
To add Terms and Conditions for a specific Product that are agreed upon checkout:
- Edit the Product you wish to add Terms and Conditions to
- Click the More Text tab
- Find the section PRODUCT TERMS AND CONDITIONS and add your terms there.
- If the product is added to the cart the products terms and conditions will be added at Checkout.
Other Options
You can also just add a page to your website that is called "terms and conditions". Such a page might be hidden, and linked from your page footer. Depending on the approach you take will decide if the T&C is sufficiently agreed to and enforceable.