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I found some code but have no clue where to add it

link to code > https://stackoverflow.com/questions/11570033/regex-jquery-to-find-domainurl-in-div-and-append-parameter

but no info on where to add it? do i need to make a custom plugin? add it somewhere ?

any ideas what to do with it ? where it gos? ??

It will allow you to put custom JS into the “Edit JS Code” screen – when you do just make sure you select the “Footer” option under “Where on page” and you should be done by pressing “Update”: https://ps.w.org/custom-css-js/assets/screenshot-3.jpg?rev=1770918