Make sure the Mac and the iPhone are connected to the same Wi-Fi network.
Open Logic Remote on the device.
A connection dialog appears on the iPhone, showing Mac computers that are on the same Wi-Fi network as the iPhone, and on which the Mac application (Logic Pro or GarageBand) is open.
Choose the Mac you want to connect to.
An alert appears in the application on the Mac, asking you to accept the connection.
Click Connect to confirm and establish the connection.
Any subsequent connections with the same device should happen automatically.