Sorry if the title is unclear. What I want to do is put an Amazon logo at the bottom of my page and add some txt like:

Want to buy this [product] cick here

Or something like that, where [product] should be a keyword that is somewhere in my article, so I would like to tell my article writer to tag this keyword in some way so that it automatically shows up in the line of txt down at the single-post.php wordpress file.

Is this possible?