When trying to connect to PixEdit Server from PixEdit Desktop you have the possibility to use the button "Find Servers". 

You may not find your PixEdit Server here for several reason. 

But you can manually type in the address to the service, like this: 

Syntax: net.tcp:// (Server name) : (port) / (Service)

a live sample may look something like this: net.tcp://2012-r2-serv-ess:8080/PixEditWebService