How do i use my infared headphones and can i use them on my laptop
You should be able to use infrared headphones with your laptop. You don't give a brand or model, but they're all pretty much the same. The transmitter connects to an audio source (and to a power source as well, so you'll need an AC outlet nearby) with the appropriate cable, and you just put the headphone on and turn on the power. Some headphones take regular batteries, while others have a rechargeable battery like a cordless phone; those are recharged when you hang the headphones back on the transmitter.
The couple of infrared headphone systems I've used both had RCA input jacks. The headphone jack on a laptop takes a 1/8-inch mini-stereo plug, so you'll need an adapter with a regular stereo patch cord (RCA plugs at both ends) or a cable with the right plug on the computer end and RCA plugs at the other. Radio Shack sells both.
If you have questions about your headphones, you can usually find a downloadable manual at the manufacturer's website.