Go into Settings in Donorfy and search for 'Email Server Settings' - you will see a form like the one shown below - choose 'Gmail' as the Pre-configured Email Server

Next, enter your Gmail email address

Click on Save Changes

Once you have done that press the Authorise Gmail button

You will then be taken to a Google form to authorise Donorfy - once you have completed that step you will be returned to Donorfy and will see a message similar to the one below

Click on the OK button to complete the process.
Once you have clicked on OK it will take you to your Home screen.