The easiest way is to remove the drum,
now there is the little cam thing that makes a zip
sound, that is the adjuster, and it's supposed to
adjust when you use the parking brake, but with new
shoes, it never adjusts right, now open the shoes a little
at a time until the drum is snug slipping over the shoes,
that should be close enough so they stay in adjustment
when you use the P brake
Good Luck
Wild