Black currants are great for jam-making and they thicken and jell beautifully. You might want to cook this jam, leaving it a bit on the runny side, since as it sits it will thicken up more than other jams.
Storage: I store my jam in the refrigerator and eat it within a few months. If you want to can it, you can find instructions online although since it’s only a couple of jars, you are likely going to use them quickly.