Well there are a couple of ways, but before we start I have been told that you need quite a bit of experience to talk to spirits. Once you've studied long enough I think then you can. You can use an ouija board or even better (not to mention easier to use) a pendulum. All you really need is a necklace and you can easily look up how to use one.I wish you luck
I recommend using The Psychic Circle board, NEVER a Ouija. Encircle yourselves and the board with sea salt. Call upon your friend and state that the ONLY spirit allowed access is that person. Good luck!