The signature on your mail might look something like this:
To change it, launch your DealMachine mobile app or log in with your computer to https://dealmachine.com
Click the menu button in the top left (mobile only)
Click "Manage Signatures"
Select the signature you wish to edit. (You only get one signature with the Basic Plan)
Here you can edit your name, phone number, return address and more!
Save your changes and your information will show up on every template that includes this signature.
You can preview a template using your signature to see your updated signature.
After doing this, you may still need to go inside a deal and hit "Reload Preview" below the mailer preview to see the updated information on the postcard.