which part of "the forum accepts ZIP files" didn't you understand?
@Christian: even worse the lvproj references the current folder as "autopopulate"…
You need to edit your MainControl.vi, the "init" case of the PLC communication state machine is important to your question!
Im not exactly sure, but it looks like you just need to change the string constant in the 'init' case of PLC to LabVIEW Communication loop in MainScreen.vi. Its hard coded to 192.168.3.101,1,0 right now. I would put this in a config file so you can easily edit it.
Help>Find Examples>Fundamentals>File Input and Output>Configuration.
That should give you a good starting point. If you get stuck, I would start a new topic specific to that question.