The Euclid plug-in currently doesn't allow you to add the location of a daylight sensor. From the Euclid project page,
One caveat on the update for EnergyPlus 8.6: The Daylighting:Controls object has changed in 8.6 and is not yet handled correctly. In the meantime the Daylighting:Controls tool and rendering has been temporarily disabled. Any daylighting sensors in your existing models will not be displayed, nor will they be deleted or modified.
This means that you will need to manually enter the X-Y-Z coordinates for the daylight sensor location using a Daylighting:ReferencePoint object in either a text editor or IDF editor.