Step 1: Connect your LAN printer to the LAN port on your Airport Express (a line with two arrows).
Step 2: Go to Settings on your iPad and tap on the Airport Express under Wi-Fi setting.
Step 3: The airport express will join the Wi-Fi network that your iPad is connected to. This is the recommended option. Enter a password for your Airport Express and tap Next.
Step 4: Once your airport express is connected to your wireless network, press and hold the feed button while powering up your printer.
Step 5: Confirm that you have a solid green light on the Ready button and there is a non-zero IP address printed in the test receipt
Finally, Go to talech app on ipad, go to Settings → Printer and tap “Auto Detect”. If the printer is enabled, tab on “Test Print” and a test sheet should be printed.