Here is the registration dialog of Tri-BACKUP (version 9).
The product name is displayed in the window title and also, in general, in the dialog itself (as indicated by the red circle).
There is a field for the name of the user and a second field for the serial number (plus possibly a third field if it is an upgrade, where you enter the serial number of your previous version).
If an error occurs, a message appears when you click the "Register" button.
Register an upgrade :
If your serial number is for an upgrade, a new field is displayed to enter the old serial number.