Insert your script in to the three hole punch and carefully depress on the tool to drill three holes through paper. If you can't fit your entire script into the hole punch, separate it into two or three sections -- but be careful to stack the pages evenly or the holes won't line up properly.
Once you have punched the holes in the script, insert the brass prong fasteners into the three holes, with the round heads protruding on the title page.
Turn the script over with care, making sure the fasteners don't fall out, and separate the two prongs of each fastener in opposite directions. Bend the prongs over the edge of the paper to make a 90 degree angle, lying flat on the back of the page. This will ensure the prongs stay in and your script doesn't have any chance of coming apart in transport.