In order to print badges for attendees, go to the attendee list screen for an event:

Select an attendee from the list:

In here, you can check the person in, see the badge preview, as well as print the badge. You can also specify the size and orientation of the badge, by default it's 2.4' in width and 3.9' in height. To change it, tap on the "gear" icon on the top right:

Now you can specify the badge width and height, as well as the orientation. When you finish, tap on the back arrow icon on the top left, your badge size preference will be saved into your device. Now you can tap on the "Print Badge" button in the attendee details page:

It should trigger a dialog box that allows you to select an AirPrint enabled printer. When a printer is selected, tap on "Print" and you are good to go.

We recommend using badge printers from Brother series, for more information, please visit: https://www.brother-usa.com/products/ql820nwb