All recent versions of Out of the Sandbox themes have the ability to require users to check an "I agree" box before checking out. You can find out how to enable this feature here.
However, many store owners like to have all or part of the "I agree with the Terms & Conditions" text be a link to a page with the full text of the terms and conditions or other policies.
This can be accomplished by editing the theme's language settings.
First, make sure you've gone under Sales Channels > Online Store > Pages and created a page with the text of your terms and conditions or policies. Publish it and open it in your browser, making note of the URL (or, keep this page open in a separate window or tab until you need it in a few steps).
Next, open the language settings by going to Sales Channels > Online Store > Themes > "Actions" > Edit language. In the search field, enter "terms and conditions" and then locate the "Agree to terms html" field.
You'll then want to edit the text in this field to contain one of the following options.
In the examples below, replace the bold text with the URL to your policy page you made note of above (or simply copy and paste it in). Note that we recommend removing the "http:" or "https:" part of the URL but keeping the two forward slashes ("//") at the beginning of the URL, as shown in the samples below in order to maximize compatibility with SSL.
If you want to only like the words "Terms & Conditions" to the page, use this code:
I Agree with the <a href="//url-to-page/" target="_blank">Terms & Conditions</a>
If you want the entire line of text to be the link, use this code:
<a href="//url-to-page/" target="_blank">I Agree with the Terms & Conditions</a>
If you want to include links to two policies, use code like this:
The code above will cause the page or pages to open in a new browser tab or open. We recommend this approach because it keeps the cart open so the shopper can quickly return to it and check out. If, however, you don't want to this behavior, simply remove target="_blank" from the code.