If your license does not exist on the TuneECU server, you must register the application.
To register, go in the menu "3  dots/License", select "Register" and follow the instructions.

With the App version 5.6 click on "Buy", you will be redirected to PayPal login with your PayPal account and complete the purchase.
After confirmation of the payment your App will be registered.

With App version up to 5.5 or if you can't pay in the app, enter the PayPal name or account that you will use to do the payment and click on "Buy".
You must connect to your PayPal account and send the payment to meeouf@gmail.com.

If you have already bought the app on the Google Store, uncheck the "New User" box and enter the Order ID that Google have sent to you when you have purchase the app.

When your license will be available, you must be connected to internet when opening the app to automatically update the license or go to the menu "3 dots/License" when connected and click "Update".

The standard license allows you to register up to 5 bikes.
The app ask you a confirmation to register, otherwise you can register the bike later in the menu "ECU/Informations" when connected.

To manage an unlimited amount of bikes (for professionals) you must buy the Pro license.
To buy the Pro license (you must have at least one bike registered), go in the menu "3 dots/License", select "Buy Pro license" and follow the instructions.