GOOD NEWS. . . . The PICTURE UPLOAD FUNCTION IS WORKING !!! The tech folks at the parent company have been able to remedy the issue. You can upload pictures once again. Thank you for your patience.
Assuming its like any other outboard you should have two screws, upper and lower, fill from the bottom till it comes out the top. I always buy two of the tubes.
I have always used the little pump that you can get to screw onto the quart bottles. My outboards usually take a little less than a quart, but with a V6 I'd assume you have the "larger" gearcase. If I were you, I would get 2 quarts before you drain it, that way you won't run out halfway through the job. If you don't use it all, you'll be that much further for next year.