You must register with Weston's online system to pay your bill through their website i.e. Weston Specialty Insurance Company.  After you register you'll be able to:

Make payments using your credit card, debit card or checking account. We accept Visa, Mastercard and Discover.
Turn on text or email payment reminders
Review your policy details including coverage limits, deductibles, etc.
View and print policy documents such as your declarations page.