Oh sorry I misunderstood, I thought it would need to be specific to customer. In that case, most of what I told you was unnecessary lol. So wherever you placed the code in customers/account.liquid – you’ll just need to put some plain HTML for what you want. So instead of the metafield code with the check to see if the metafield was blank that I provided above, just do something like
Here's some text you want to output on every customer account page. [Here's a link for your marketing information.](https://google.com)
Just replace the text with whatever you want and replaced the “href” attribute with the link that you need to provide everybody.