In the upper right hand corner of the Hoopla web app, go to your profile photo and select "Settings". Then scroll down to the Subscription section.
To view receipts or change billing details like contact information, address, etc., click View or Edit Billing Info.
This will open a new tab, showing your subscription information, invoices and billing information in one page.
When you're done making your edits, you can return to Hoopla in the previous browser tab.