If you're looking to change the SIM card associated with your account: Go to "Change SIM Card" located at the bottom right on My account page. (Not sure if this link will work, once you're logged in) https://selfserve.publicmobile.ca/Overview/plan-an...
I am going through this at the moment as well. I have sent a PM to the Moderator Group and waiting for a response. To date, they've replied with an email to verify my account. I'm half expecting a response at some point tomorrow. But basically, send...