Connect an iPad to the network
Open the iPad settings app
Select WIFI near the top left of the screen
Touch the network that will be used exclusively by the POS system from the NETWORKS list. LinkPOS uses a naming scheme with Printer in the name so select something like SZPrinter. Enter the password and connect to the network.
If another network is selected you will need to forget the wrong network and then select the correct network. The POS system will not work unless all the devices are on the same network so select the wrong network and touch the Forget This Network button.