In Settings, open "Security & Privacy".
On macOS 10.5+ (Catalina)
1) Under the "Privacy" tab, click on "Automation".
2) Under TntConnect, check all the boxes.
On pre-Catalina 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".