To transfer a route to your BMW car, you will need a USB stick.
Create a folder named "BMWData" on the USB stick first. After that you can use the MyRoute-app Connector and select "BMW Car" as the preferred device to export to.
Once the route is transferred, you can place the USB stick inside your car and use the media system of the car to import the route from the USB stick.
Note: Due to a limitation of BMW, only one route can be imported in the car. The system will always pick the last route that has been exported to the USB stick.