Modify payment frequency
You can pay your premium per month, quarter, half-year of annually, which ever you prefer and you can choose the date on which it's done. You can modify the requency online and from then on following frequency is on the date you choose.
Receive discount for premium for half-year or annual payments
For annual payments the discount is 1% and for half-year payments it's 0.5%.
A payment plan for your premium is always per month
If you want a payment plan for your premium and you pay per quarter, half-year or annually, you will need to modify your payment frequency or you won't be able to apply for a payment plan.