It is common practice to remove all unnecessary links and navigation bars from an opt-in page so that users are focused towards a call-to-action.
However, your landing/opt-in page should always have a link to your Terms & Conditions and Privacy Notice Agreements on it.
There are just 3 steps to follow:
Step 1 - Create your own documents via the links below:
• Privacy Notice:
http://connectio.io/privacy-policy-generator
OR
https://www.freeprivacypolicy.com
• Terms & Conditions:
https://getterms.io
OR
https://termsfeed.com/terms-conditions/generator
Step 2 - Once created, they should be added to your blog, each on a new, separate page (just create a Page under the main Menu within Blogger).
See this article here for a video on how to add your Privacy Notice and Terms & Conditions to Blogger.
Step 3 - Then link your opt-in page to the Terms & Conditions and Privacy Notice pages on your blog.
Please see the below video for how to do this: