Then, you can't have looked at the tutorial. I think?
You import your .d file in the normal way with Skyline. File > Import > Results
But, you need to set up your targets and in the case of PRM, you would then export an instrument method, collect data specifically for your targets and only then import that data into Skyline.
If all you have is some DDA data you have collected on an ion trap, then Skyline is not the tool for you. You can review the tutorial on DDA data:
But, I wouldn't recommend trying this without high resolution mass spec data.
Hope this helps. You really will need to do some reading if you want to become an effective Skyline user.