In Environment, click on Networks then HLA.
We will first open the HLA settings window by double clicking the HLA diagram part (or right click, then Settings)
Then we select the file: vsTasker.xml
Now, let's select the RTI to use.
If you have Mak RTI, select Mak 1516 (or Evolved)
If you have Pitch RTI, select Pitch 1516 (or Evolved)
For now, it done for the RTI settings.