You can activate your fileeeBox in two ways:
You open the fileeeBox menu in the fileeeApp and click on "Add Box". Afterwards, a menu opens by which you have to click on "Setup box or supplies". Now you can choose if you want to set up your scan add-on or fileeeBox. fileee guides you through all the steps.
Put a document on the box (or in the add-on) and scan the document. fileee now recognizes the unknown bar code and suggests you to activate your box.