SEO Helper 404 page and GoDaddy

Rebuilding a site with Joe Workman’s SEO Helper and it’s looking pretty good. Before I push everything, I’m trying to get the 404 page working properly on the current site and that’s my issue. I’m hosted at GoDaddy running php 7.2 (I’m there for a lot of reasons with a lot of stuff and have been for a lot of seasons) and their 404 for this looks different. They have a 404 Errors input page in cPanel that should work just fine. Except it doesn’t. I’m missing something simple (most likely) but I don’t know what. I can usually rummage around the forums and find answers to questions, but nothing on this one. I’ve attached a couple images.