I use QR codes in my printed documents to point to online user guides that I generate in Framemaker. But if the url changes for some reason, why can't I edit a QR code that I generated in Framemaker. That option is always disabled when I try to use it?
Instead of editing the existing code, have you tried inserting a new one instead?
If you're looking to update an existing graphic, you would be able to create a new QR code using Fm or any other QR code generator, and then replacing your current code graphic with one that has the same name in the same location.