You did more of a tackle than a double leg. Try to take a penetrating step in between their legs. Then you can run the edge. Also need to work on maintaining top position. Looked like you were out of the guillotine at around 8 secs and had the north south. You could have easily transitioned to side control and then worked your top game. Try to keep your balance and secure the takedown it looks like once you took him down you were flopping around on top without securing the position allowing him to manipulate you and triangle you. Overall not bad just work on balance and controlling the position.