Where do I find the list of devices associated with my Bosma account?

You can find all devices in the Bosma app: Home Screen -> Menu (top left corner) -> Devices.
Note that if you have an active Family, the list will only show devices under that Family by default. To view all devices under your account, either add all devices to your Family, or switch to personal view on the home screen by tapping the Family name at the top and selecting your nickname in the dropdown menu.