This is Rae from Shopify. Thanks for reaching out about your terms of service. I can definitely help take a closer look into this!
To clarify, are you trying to replace your current terms of service with Shopify's template? Or, are you trying to personalize and edit Shopify's template before publishing it to your site?
If you're trying to add Shopify's template without making any edits, just follow these steps:
This will add Shopify's unedited template to your site. However, we do recommend that you review this template entirely, as you may need to make changes to it to ensure it suits the way your store operates. Check out this help document for more details on this.
If you're trying to customize Shopify's template instead though, you'll want to follow these steps:
This will allow you to use Shopify's template as a starting point, and still apply your own edits before publishing it to your site.
Let me know if these steps help resolve things, or if you're still running into troubles with this, and I'll be happy to continue helping out!