I have a golfball size hole in my pool screen. How do I repair this?

Are you referring to a screened enclosure above.around a swimming pool?

If you can reach the hole with a ladder, here's how I did it. I got some screening and some spray glue at Home Depot or Lowes(I don't recall which). I cut a piece of screening that was about two inches wider than the hole. I sprayed both the piece of screening and the area around the hole. I waited until the spray got real tacky and then pressed the piece in place. Note that if it's a tear, I do not recommend snipping away any of the screening. Leave it in place and spray it with the glue The result is not a work of art but it does the trick and it's an inexpensive repair until you're ready to replace all your screens.