Once the user registers their company username using the "Accept Invitation" link from the first email, the next step is to connect to the port using these 3 steps:

1) Open glassbox-<your company name>.surgeoncheck.com from Chrome

2) Click the "Try Free" on the Power BI Pro notification

3) Type "<your company name>" in the search box (upper-right) and select "<your company name>" with the graph icon from the drop-down

That's it!