My neuro told me to Google where the bladder was in the body and he showed me by pressing gently on my hand and going in a small circle. So I push gently on my abdomen where the bladder is located and rub in small circles, like massaging a small knot in a muscle.

Now that I can feel my bladder, like a hard lump, I concentrate on massaging gently there and as I go I feel it get smaller and smaller until I can't feel it.