First you have to get to the rope. There are two ways to get there. Proceed the level until you get to the first red container on rails after the jumping and climbing section. The first and longer way to get to the rope is to go trough the cave where the gems are. When you stand in front of the red container turn right and jump the pillars next to the wall until you reach the cave. Take the lamp its very dark in there and make your way to the end where your way is blocked by bars. You can bend them with the stick laying around and go trough. Now you're at the rope. The second and easiest way is to climb on the container then grab the wall and walk till you can reach the other side of the passage which was blocked by the container. Now you can easily climb up towards the tree where the rope is. Grab the rope with both hands run towards the edge and jump. Now you have to release at the right time to fly across. Maybe you need a few tries just load last checkpoint and you start at the container. Climb up and try again.