First, sterilize your jars as instructed below.
Remove all seeds from the jalapenos. Wear plastic gloves when doing this, as they can burn your skin. Rinse out any remaining seeds under cold water.
Chop all peppers into very small pieces. (you can use a food processor but be careful to not over chop. Peppers can become liquid very quickly.)
Place chopped peppers into a large pot. Add ¼c. of the granulated sugar and the pectin to the peppers. Stir. Add in the water and vinegar.
Bring to a full rolling boil and boil, then add in the remaining sugar and stir. Return to a boil and boil for one minute.
Ladle into the prepared jars. Clean off any jelly that may have gotten onto the rims. Place lid discs onto the jars and screw on the jar rings. Place jars into a large pot of hot water. Can use the water you used to sterilize jars. Just may have to remove some of the water before placing jars in. Once jars are in the water, add any additional water needed to cover the jars by at least an inch.
Cover the pot with a lid and bring to a boil. Boil for 10 minutes, then remove jars to cool on your counter overnight to thicken.
Can be stored in a cool, dry place for up to one year.