You can find your plan number on page 3 of your summary. It starts with JTY- then the year it started, and should be listed underneath your address.
You should also have a copy in your email inbox (with the subject line "Welcome to Jetty") and you can access it (and a lot more!) by logging into your account page.
While we're on the subject, you can also check out page 5 of your plan summary to see what protection options you have and how much.
Feel free to contact us at firstname.lastname@example.org if you have any other questions!