In Settings, open "Security & Privacy".

On macOS 10.14+ (Mojave)

 1) Under the "Privacy" tab, click on "Automation".

  2) Under TntConnect, check all the boxes.

On pre-Mojave macOS

 1) Under the "Privacy" tab, click on "Accessibility".

 2) Grant TntConnect the ability to control your computer.  Make sure it is included in the list below where it says, "Allow the apps below to control your computer".

Other Things To Know

When you're running TntConnect, if you get any of these prompts, it's in your interest to click "OK":

If you didn't give TntConnect access to your Desktop or Documents folder, you can always to it later: