If you the device is not automatically detected you can try with:
Your IoT device must be on the same subnet network.
Windows: Please make sure Bonjour is installed. ( click here for instructions )
Linux: Please make sure avahi-browser or libavahi-compat-libdnssd1 has been installed.
( click here for instructions )
If this doesn’t work either, you will have to continue adding the device manually.
Your "click here" links does not work.
The XDK finds the Intel Edison. Sow must be somthing with the Galileo, also the galileo local host name does not work. (on my edison its called, edison.local)
galileo.local does not work. had to use ip address.
You need to use the IP address of the board while using the XDK.
Also, do you have Bonjour installed on your PC? Also check the subnet network of the device and the PC.