Hi! I'm a magazine owner on kbin.social and ran into this same problem. I'm not sure if Lemmy and kbin have the same submission forms but I'm willing to try to help.

If you're open to it, you can direct message me and maybe we can set up a quick screen share on discord or zoom?

On a lemmy instance. Its only after they leave a post or comment. Select the dots on the message. Add mod.