Activate the yeast by dissolving it in the warm water and sugar and letting stand for about 10 minutes. If it foams it is activated, if it does not throw it away and try again. 

Add 2 cups AP flour, salt, yogurt, activated yeast (and the water you activated it in) in a mixing bowl and combine

Knead for 10 minutes

Cover with plastic wrap or a clean damp towel and allow to proof for at least 30 minutes, 1-3 hours preferred. 

Knock (beat some of the air out of it) the dough back to a ball about half the size it was

Cut it into 8 pieces and roll into balls 

Roll the balls out into circles

Cook on medium high skillet or non stick pan with a little bit of butter or oil

Flip when golden brown 

Bread is done when it is golden brown on both sides