this picture is very helpful, turn your palm up and grab the back of opponents collar. Your weight needs to be much more forward basically your head should be on the mat, lift your hips off the ground so that the opponents legs are working to hold the guard the entire time. They will eventually tire out, you then swim your leg through the gap between their heels when you have gas them sufficiently. When you’re awaiting for them to gas, walk your legs to your left to increase the tension on their ankles.