Setup Inputs is where you tell your iGrow1800, what sensors you are using (this is also called sensor mapping).

Here is a video on iGrow 1800 Setup and Calibrate Sensor Inputs

Now to get to the Screen 

Now to Program Setup Unputs / Calibrate Inputs, you would do the following:  Hit Enter/Menus -> then go into System Setup -> and then choose either Setup or Calibrate Inputs and then hit Enter/Menu.

SETUP INPUTS

The following screen shows the typical sensor mapping for each sensor. If you don’t have a particular sensor then leave the setting as None.

To navigate in this screen, hit Prev and Next, to change the mapping of a particular sensor you would hit (+) or (-)

CALIBRATE INPUTS

Calibrate
To calibrate an input you must first select the sensor you want to calibrate. Press the + or - keys to cycle through the various sensors. Once you have selected your sensor, press enter and it will take you to the adjustment line.
Raw Value
Raw Value is the direct reading from the sensor. Using the + or - keys will add a positive or negative adjustment to the raw reading giving you an adjusted value.
Adj Value
Adj Value is what will be reflected on the front status screen.

Here is a view of Setup and Calibrate Input Screens with LinkConn 1800 Software which provides a simpler control view.