You'll receive email for online lecture scheduled by your lecturer. Depending on the online teaching / meeting platform the lecture is conducted, you may receive one of the following messages:
Either join the online lecture with link provided by your lecturer or
For MS Teams
You will receive a message from your lecturer or from an email address with the course code. At the bottom of the message, you will find "Join Microsoft Teams Meeting". Simply click on the link to join the session at the scheduled time. In addition, an appointment will add to your Connect calendar.
For supporting browsers / mobile apps for Blackboard and MS Teams, please refer to https://www.polyu.edu.hk/its/online-learning/index_detail.php?id=5