Please remove your plants from the packaging immediately. Pot individually into 9cm (3.5") pots using a good quality compost, keep just moist but do not over-water. Once the plants are well rooted in the pots they can be planted out, or potted on if you are going to grow your Chrysanthemums in pots.
Follow the links, on the left, for specific growing instructions depending on the varieties you are growing.
You must protect your plants from any frost.