You can add a task in two places.
From Action Items
Choose New action item.
Enter a title, up to 200 characters.
Choose the meeting it belongs to. You need at least one captured meeting.
Choose an assignee, or leave it as yourself.
Save.
From a meeting
Open the meeting and find Action Items.
Choose Add action item.
Enter a title and, if you want, details up to 2,000 characters.
Assign it to the host, a participant, or leave it unassigned.
Save.
The new item shows on the meeting and in Action Items.