The most important thing is linking your mapbox account with your bubble app
How do I do it?
First, open your bubble app and on the left hand side you’ll see a menu:
Press on the “plugins tab and you’ll be presented with your installed plugin. In the list find “Advanced Mapbox Plugin” and press on it. On the right side you’ll see the plugin description and a field called “Mapbox API key”.
In the input field you need to paste your Mapbox API key.