Assuming you want to make a pair of compression arm sleeves out of tights, here are the steps:
1. Cut the tights at the waistband so that you have two long tube-like pieces.
2. Cut a small hole in the foot area of each tight. This will be where your hand goes through when putting on the sleeve.
3. Put one of the arm sleeves on by slipping your hand through the hole you just cut and pulling it up over your arm. The sleeve should fit snugly but not so tight that it cuts off circulation.
4. Repeat with the other arm sleeve.