To flash your ECU connect your interface cable to your car, ensure your car is parked somewhere sensible as this may takes some time and ensure you have both adequate vehicle battery and laptop battery and good internet available. If doubt move elsewhere and use chargers as appropriate.
When ready select Flash a Tune and click next on the home screen.

You will be prompted to connect to your vehicles OBD port do so now then press next and follow the instructions. Once complete the ECU identification and license details will be shown. If your vehicle is not yet licensed you will be prompted at this point to license your vehicle. The cost in credits will be displayed and a warning given to you that a transaction is required.

Next you will be given a list of available Tune Groups or Stages available to you as well as any free files or custom files. Free files will be purchasable at 0 credits. If you cannot find the tune you need contact support and request for it to be added. If you have a special unique requirement a custom file maybe available to you also, again contact support to request this and discuss any costs if required.

Any tunes that are licensed to you will appear in Green. Any that are Greyed out will require you to make a purchase with the displayed cost in credits. All tunes in that folder will become available to you once you make a purchase. Se;ect a file and click next. You will be prompted to purchase if required automatically.
Next you will be presented with a warning to ensure you are definitely ready to flash follow the on screen steps. Only when you are happy proceed further.

You will now be able to start flashing your ECU, when ready press start and wait patiently and follow any instructions exactly.

Once compelte click next to return to the Home Screen and test your vehicle. If you experience any issues contact support immediately.