Place the rhubarb and sugar into a large saucepan. Let sit for 5-10 minutes or until sugar becomes syrupy. Turn heat on and bring mixture to boil. Let the mixture cook over low heat until rhubarb softens. Approx-10 minutes. Take the saucepan off the heat and stir in the jello. Mix well. Spoon jam into jars and allow to cool completely before sealing. Jam stores in the freezer for up to 1 year and in the refrigerator for 6 weeks.