how can i refill a mont blanc meisterstuck fountain pen?

i already have a refill ink available. I just need to know how to put the ink inside the pen. Thanks

Unscrew it and you should see a piston converter inside. Twist it and you'll see the piston move up and down. Twist it so the piston is all the way down. You can refill it by dunking the pen's nib in ink and twisting it to pull the piston back or pull the whole converter out of the pen, stick the end of that in the ink and do the same thing.