Set up the badge printer using the detailed instructions described here

Once the printer is connected to the network, log in to InstaCheckin Web Dashboard and navigate to Kiosk Settings > Visitor Badge.

Select the “Print Visitor Badge” checkbox and enter the IP address (e.g. in the Badge Printer IP Address box and save the changes. Now, you are ready to start printing visitor badges for your visitors. Perform and test check-in from the InstaCheckin iPad app and verfiy that a visitor badge is printed.

Brother QL-820NWB Printer Setup Visitor Registration