how do you do this? ive only done it on F150s and dont know if it is any different.

 

At the bottom of each backing plate is a rubber plug. Pull them out and use a small scredriver to spin the adjuster.

 

You can also get a brake tool kit. I picked one up years ago, makes working on brakes much easier. Has a combination tool that is used to remove and install all the springs in the drum, another tool to remove that pesky retainer spring, and a small crowbar looking one that is used to adjust the brakes from the access port. It is curved just right to make short work of it, although a screwdriver will work in a pinch.