Unplug the cables from the model B3
Depending what it is being used for and how it is connected to the internet, the power cable, card reader cable, &/or ethernet cable should be unplugged
Note: the monitor above is flipped upside down on the mount to show the cables
Unscrew the screws from the back of the monitor (4 screws - put these away for later use)
Note: hold the monitor while unscrewing to avoid the monitor from falling down after it is no longer secured
Remove the monitor
Align the replacement monitor with the mount and screw in the 4 screws from the previous step, tighten all 4 screws
Plug the cables back into the replacement monitor
If applicable, connect your card reader to the device, following this guide
To register the device to your store, follow this guide
Tidy up the cabling so that it will not get caught or snagged and is as hidden/neat as possible
Your replacement is now complete!