HOW TO FILL A FRESH TRANSMISSION?

Put 5 inside the trans. This is in addition to what's in the converter. Start car in Neutral, not park
As soon as it starts pour more fluid in. Be ready before the engine starts. Have the funnel in the dipstick and the rest of the fluid on the fender or on a cart or bench right there.
Now run it through the gears.

It will take about 11 quarts total. So you do the math. How much is in the converter now?