Which link do you have?
The link tells you what to expect:
If the link asks for a password, it is usually in your invitation. If it is not, ask the person who sent you the link.
Guides
Join a live session
Enter your name, set up camera and microphone, join.
Camera and microphone
Mute, turn on your camera, switch devices.
Draw on the picture
Mark something on a live stream or a file.
Comment
Comments on a file stream and in a share.
Take over moderation
Control playback for everyone when the host hands it to you.
See colour correctly
Set up iPhone, iPad, Mac and your room for a colour review.