Canceling your plates Besides not being legal to be on the road, unregistered vehicles are not covered by your home, tenant, condo, or farm policy - even when parked in your garage! Talk to your broker before cancelling for best options on storage insurance. 1 Login to MySGI. 2 Click My Vehicles on the top navigation bar. Click Cancel my registration under the Transactions header. 3 Use the radio button next to the plate number to select and active vehicle registration to cancel. Click Submit 4 Review the cancellation details and ensure that you have selected the correct vehicle, Select a cancellation reason, choose the address you would like the refund sent to and click submit. 5 Review the refund details. Review the two confirmation messages above the submit and back buttons. Click the check boxes and submit. 6 Print the confirmation page for your records if desired, your plate is now cancelled.