[Microshock]

You put the stuff in a box. If its easily breakable, you wrap it in bubble wrap. Get a marker and a piece of paper and write the return address (yours) in the upper left corner and the recipient's address in the middle. Tape it nice and securely to the top of the box. Or just use a marker and write on the box itself.

Then you take the box full of stuff to a post office. You wait in line or use the automated machine.

If you wait in line, give the box to the postal office worker and then they will do it all, you pay them 5-10 bucks. If you use the machine, do everything it says, put in a credit card and let it print out the sticker and put it on top of the box, then dump it in the big blue box.

Done.