I have been going through the 6 steps to activate online and the system has been stuck at step 3 for an hour and it only shows 'processing' at the bottom. There is no way this should take so long.
@imager is step 3 payment? Can you use another tab to see if your credit card was charged? If it was insert your sim and try to log into your self service account.
Here's an article on activating https://www.publicmobile.ca/en/bc/get-help/articles/activation-account-set-up