The template (and most templates) pull from the page properties set by the infobox. So the edit you made to the infobox template was actually all you had to do, but it wouldn't show as working in the preview because the properties aren't updated until the edit is approved.
I know thats confusing. Hmu either here on the wiki or the community discord if you have any questions, either about this or anything else you come across editing the wiki.