You’ve linked the virtualmin-git module, which has nothing to do with vsftpd. There is a vsftpd Virtualmin plugin, but that won’t work without Virtualmin (and you should not install Virtualmin just to manage an FTP server, as the vsftpd support is rudimentary at best, and long unmaintained).
If you don’t know how to configure vsftpd already, it seems like you’re going to a lot of trouble to use an FTP server you don’t have any reason to use over alternatives? I mean, if all you’ve done is dnf install vsftpd, you shouldn’t consider yourself tied to vsftpd.
ProFTPd is in the EPEL repos, and it has a full Webmin module (not just Virtualmin plugin) that is maintained. If you need to manage your FTP server in Webmin, you need to use an FTP server that has a Webmin module.
Thanks. I was familiar with vsftpd having used it for about 20 years. I though I remembered sometime in the past using Webmin to manage VSFTPD. Not a big deal, I may try ProFTPD, but may also just do the simple cli config for vsftpd.