Your opponent has you in the guard and you need a submission or something to distract your opponent.
Grab both sides of your opponents gi with your fingers on the inside. Your thumbs should be facing you.
Take your right hand to the right of your opponents wind-pipe and pull with your left hand to take off the slack.
Now drive your right fist down to the ground. You may want to come up on one or both legs to apply more force and get your weight behind it. Since your right arm is straight you need to be very careful that your opponent doesn't arm-bar you. Remember to pull with your left hand to remove any slack.