Brother printer QL-720NW only support pocket wifi that have WPS function.
To make the first time connection:
Connect printer with pocket wifi
Step 1) Turn on pocket wifi and printer
Step 2) Turn on WPS function on your pocket wifi
Step 3) Press the WiFi button on printer, until the green light is in very quick, continuous flashing
Step 4) When it is connected, the light will turn to a stable green light
Connect iPad with same pocket wifi network
Step 5) On your iPad, go to iPad "setting"
Step 6) Click "wifi", and ensure you are connected to the same pocket wifi network as Step 1-4
Connect iPad - Check in App with the printer
Step 7) Login to check in App, and click into the correct Event
Step 8) Click "Setting" icon on upper right hand corner. Scroll down the menu bar and click "Select Printer"
Step 9) Check if the printer is connecting to the correct pocket wifi, if yes, press "Next"
Step 10) Ensure it is choosing the correct printer, if yes, press "Next"
Step 11) Press "Print" and label should be printed on the printer you assigned
1) If failure on step 9 or step 10, meaning the connection is not correctly done. Please start from Step 1 again to retry
2) If all the settings are correctly done from Step 1-10), and only the label cannot print out, check to ensure correct label size is used