I am trying to make baking powder biscuits for strawberry shortcake.  i followed the recipe on the baking powder can and i was trying to roll them out but the dough doesn't stick together very well.  I was able to get some biscuits cut but not very easily.  Should I add more shortening or more milk? 
Yes your ratio is off. After melting if your coating is too thick add vegetable shortening (Crisco) a little at a time until you reach the desired consistency. Start with a tablespoon per pound and add just enough to get to the consistency you need. Crisco is solid at room temperature unlike veg. oil so your final product shouldn't have to stay in the fridge.  