I have no idea how to do this.
Any help would be appreciated.
short? what do you mean by short? Can you rephrase that? If you meant sort, I think coinmarketcap is a good place to look .
Shorting a coin is basically betting against the coin, when you buy bitcoin then you are expecting for the price to go up and that is the way you make profit, but when you short a coin you are expecting for the price to go down instead of up that way you can make money when the price goes to the opposite direction and for those with great skill is a way to make some good money.