Watch the video
or follow the steps
Step 1) Goto https://teams.microsoft.com
Step 2) Login to the above with the subject ID and password (contact administrators if you don't have this)
Step 3) No need to do anything else in the teams login, just open a new tab in chrome and goto
Step 4) Choose your subject and click "Continue on this browser"
Step 5) When prompted, click allow microphone and camera
Step 6) Join Now
Teams View - Assign class notes, homework and interact with students using teams.
Suggested link for further learning