Jam didn't jell fix

Here is the info from my Master Food Advisor manual. Measure jelly to be recooked. Work with no more than 4-6 cups at a time.

TO REMAKE THE JELLY WITH POWDERED PECTIN:
For each quart of jelly, mix:
1/4 cup sugar
1/2 cup water
2 Tablespoons bottled lemon juice
4 teaspoons powdered pectin

Bring to a boil while stirring. Add jelly and bring to a boil over high heat, stirring constantly. Boil hard for 1/2 minute. Remove from heat, quickly skim off any foam.

Fill sterile jars leaving 1/4 inch headspace. Adjust new lids, process 5 minutes in water bath canner.

There are also different directions given for liquid pectin and a way to remake by cooking using a candy thermometer.You can always use as a topping for ice cream or pancakes just the way it is. Hope this helps.