Please explain in detail how to do this. Many people will have questions, and more will arise!
You click on the message number with the application form, and a window pops up. You look at the URL, copy it (Ctrl+C), in the signature, highlight the text for the link, click on the "globe with a chain" icon, and paste it...
You are not the first to ask about this. I, for example, asked Tengro.
