Stick the hook end into whatever you’re trying to turn.
Feel around through the fabric and make sure the flap is open then press the hook through your fabric.
With your thumb of your dominant hand in the circle end of the loop turner pull a little with your right hand and with your left hand massaged the fabric over the stick to get the turning started.
Gently pull with the right hand until the right side of your item is free. You can continue pulling with the loop turner but I like to do as little as possible so that I don’t get impatient and pull a hole in the fabric. Then I just finish pulling the fabric over itself with my hands.