You can save seeds in a few different ways it depends on when you would want to use them. If you are going to use them shortly after the purchase you can save them at room temperature. Keep them out off the sun. If you want to save them a bit longer then they will have to be on a cool, dry and dark place like for example your refrigerator. 5 degrees and low humidity will make sure your seeds still germinate after a few years. Germination will slightly reduce. Good preserved seeds can still germinate for 80% after 5 years and after 10 years for 60%.