When you have completed the process of creating/editing the options for your session, return to the session list and click on the ... (ellipsis) button to lock the session. This prevents you or anyone else from editing important aspects (e.g., changing the tests because that would corrupt the saved results).
Once the session is locked, you can click the View button on the right to view the dashboard for the session. This dashboard is designed for administrative tasks. Initially, you can use it to email the test codes to examinees or to copy the examinee test code to your PC clipboard. The latter is useful if you signed yourself up to take the session for quality assurance; you can then go to the root of your sub domain (e.g., myorg.assess.ai) and enter the code to take the session. More information about the examinee side is here.