Adding text on top of a custom stamp

I created a custom stamp that needs text to be edited on top. It's an approval stamp (replicated from a rubber stamp) that we are trying to use digitally. There are spaces for codes and job numbers and approval initials that need to be filled in but the text doesn't show when I "edit text" > "add text". Any suggestions on how I can do this? It kind of defeats the purpose if it needs to be printed, hand written then scanned. Thanks for any help!