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The other participants can simply join the live meeting that you started by clicking on the "Join" button that appears in the chat.
The live meeting window looks as below. It makes possible to share screen, share files (like Powerpoint presentations), use a pointer to emphasize some part on these files, to annotate files (making annotations visible for all participants).
Live meetings can be recorded, and will then be available in the Documents library of the participants.
At the end of the meeting, simply click on the button at the top right: "End"
Creating a new workspace
Depending on the permissions set by your platform administrator, you can find on the left bar a button allowing to create a new collaborative workspace.
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Your new workspace will appear.
By clicking xxxxx
on that button, you can see the members of that workspace
To add new participants, just click on the "Edit" pictogram at the right side of the workspace in the list
Then select new participants by moving them from the left box to the right one, and save.