I Got IT!!

I have had the hardest time learning to crop images to a 4x4 size and having it print square through Costco.  At one point, I got it to work, months ago-- but then tried again and it didn't.  I am wanting to make some square prints for some Mother's Day Cards- I think I finally have a reliable technique cemented in my brain!! Yay! :) Seems silly, but this has been plaguing me, and it is a relief to get it figured out.