The articles linked by Little Beast show how to do the adjustment.
To help with determining how much to adjust, after each small movement of the adjuster, start the car and with the front wheels up off the ground, turn from lock to lock.
If there is even the slightest binding at any point, the adjustment is too tight.
Good to do the above before you change anything, so that you have a reference to how it should feel.
If the internals have worn unevenly, you will get some tight spots while other areas still have slop.
That is when you have to replace the parts.
PK