1. Contact your current provider, with your name and the date you want to cancel.
Tip: Most other providers (i.e. MPS) provide occurrence-based insurance, meaning any incidents that occurred during the period you were insured with them should still be covered even when you're no longer a member of them.
2. They will confirm your cancellation, and you should receive a pro-rated refund of any unused time for the year.
Start saving ~$600 per year!