Printing the client address in the label for controlled substances is managed by a clinic setting. To get to clinic settings, choose the "Clinic Settings" option from the gear menu in the upper right corner of VetBadger.
Once on the Clinic Settings page, you can scroll down to the "General" section. Here you will see the available options. The option that controls adding Client Address for controlled substances is labeled "Add client address to controlled drug labels".
Toggling this on will enable client address printing on the labels for controlled drugs.