In the Admin tab you can find a section called General Settings.
In the General Settings you can define the Confirm, Cancel and Error URL to be used in the module that was integrated in your webshop.
To be able to connect between your webshop and your shipping manager account, the passphrase can also be found and updated here.
When you access these settings you will receive a Licence Agreement about the use of a module and the bpost shipping manager.
You must confirm this to get access to the settings, the confirm button can be found at the bottom of the document mentioned.
Note: you will only have to confirm this agreement once