Like Jeremy said, Walk up to the 10th, you should land on that note with your ring fing. Start a whole step down and walk half steps to the 10th. You should land on the tenth with your ring finger. While holding the 10th with you ring finger, take you middle finger and play the 4th and walk down to the third which is a half step. you should land on the 3rd with your pointer finger ( index finger). Make sure the 10th is still ringing out with the 3rd. While these are ringing out , take you middle finger again and play the one. Listen to the video to get the timing right. I tried to make it simple but sometimes, well for me, it's easier if I actually saw someone do it.