No, sorry. We didn't have to use Gtags on our site. I assume you tried
installing the gtag.js file to your site using the Google provided
documentation already but running into some challenges. gtag.js
Developer Guide | Global site tag (gtag.js)
We are not able to see your images, but it sounds like your are trying
to setup a Google RLSA. I recently set up a Google RLSA using the
following document - Send Segments to a Google AdWords Remarketing List
Hope that helps and is what you are needing.