Login to bubble.io and go to myapps
Find out the right app and then click the pencil icon
If you see an upgrade warning, make sure you cancel it!
Go to Settings
App plan tab
Select the plan
Cannot use the hobby plan as it doesn't allow custom domains and backend workflows which are usually needed for app.
We usually recommend personal to begin with.
Confirm!
We have probably built something similar before, let us help you