Step 5: Gently pry back the diaphram.
Note how everything is oriented. You will need to remember how that blue gasket cover is positioned when you reassemble the parts. I look at the part that looks like a little arrow facing up.
We will have to do this for both sides, so note all these steps for the other side as well. On the other side it's as if everything is rotated 180 degrees so on the opposite side the arrow on the gasket cover faces down. You can do both sides at the same time or first one then the other. Whichever you find easiest.