As a meeting organizer, you'll have the option to add participants before or during a meeting.
On desktop (macOS, Windows, or on Wire for web)
Before a meeting
Select Meetings to open the meeting overview:
Select the meetings options:
Select Edit Meeting:
Select the people you want to add to the meeting, or unselect people you want to remove.
Add participant during meeting
Select meeting options.
Select Edit Meeting.
Select Participants.
Select the people you want to add to the meeting, or unselect people you want to remove.
Select Save Changes.