Your cash drawer will connect to your Receipt or Tag printer using the RJ-11 or RJ-12 cable that it comes with.
You connect this cable into the RJ-11 port that will be on the back of the printer.
Once connected go to the Settings->Printer page in your CleanCloud account and then click on the Cash Register button in the left menu. There you can specify if your cash drawer is connected to the receipt printer or tag printer. You can also specify if the cash drawer should open automatically with a payment.
Once you have selected your options press the Update button