: Hold the paper between your first two fingers. The flat "cross" of the T should rest against your fingertips, while the folded section with the slit sticks out between your fingers.
If you want a "screamer" that makes a loud bang rather than a high-pitched whistle, you can follow a Paper Popper tutorial which typically uses a full sheet of A4 or printer paper. Printable Templates and Resources Screamer Free Download
: Fold about half an inch of each end of the strip outward to form a "T" or bridge shape. : Hold the paper between your first two fingers