Thanks
@arbitrage000. I successfully edited my design with a minor tweak to the the link to use Canada domain.
Steps:
1. sign in to Tesla account
2. click Manage on the order
3. use this URL and add the RN# at the end
edit-design/RN##########
4. It should load the design page with `Review Design` button
5. Click `Review Design` and then finalize
Yieeee!!