Basically you walk into a western union store. Must be 18+ with ID.
If your the sender, you must fill out a form including the persons name, city and state.
Once you do that, they'll take the forum and give you a receipt. On the receipt is the MTCN.
Give the person the MTCN. And now lets proceed to getting the cash.
The Person with the MTCN will go to their own Western Union location, fill out a form including the Senders Name City and State. Show their ID and they get the money.
Thats it.
Avoid getting scammed, if your the person receiving money, always pick it up BEFORE sending the goods.
Once the money is picked up the process is irreversible