From the settings screen, tap Configure Cash Drawers.
Tap the name of the configured printer that the cash drawer is connected to.
Tap Cash drawer attached.
You have the option to enable the following settings for the drawer
Tap Use two cash drawers with splitter if you have two cash drawers attached to one receipt printer.
Tap Disable POS when either cash drawer is open to disable the cashier from ringing a new transaction until the cash drawers are closed.
Tap Ask before opening cash drawer and the system will ask you if you want to open the cash drawer after every transaction.
Once configured, tap Test cash drawer to test if the drawer is connected properly and will open.