First of all, ensure your Figure app is on the latest version. If not, download and install the latest version. See a step by step manual on how to update your POS.
[1] Ensure all cables from your cash drawer are connected securely to the receipt printer.
[2] Verify that your cash drawer is enabled to open in the Figure app settings
[3] In the Figure app go to Settings > Printers > Click the Settings button next your assigned printer > Click Cash Register -> Save
You can download our Troubleshooting Guide PDF with all the common questions.