Lemon Blueberry Jam

I've never tried making jam before, but this one seems pretty straightforward, so I think I'll give it a go.

Ingredients:
4 cups fresh blueberries
2 cups sugar
1 package lemon jelly
2 t. pectin powder

Method:
1. Mash up the blueberries either through a food processor or with a potato masher for a chunkier jam.
2. Place the blueberries in a medium saucepan, add the sugar and cook on medium heat until it boils, stir constantly.
3. Simmer on low for about 20 minutes and then add the lemon jelly and pectin powder. Cook until powder has dissolved and remove from heat.
4. Pour mixture into seal-able jars and place in the refrigerator to cool and thicken.