The Activities widget shows the appointments and tasks created for the lead.
Press +ADD to create a new appointment or a new task.
Clicking an appointment or a task opens the respective dialog for you to view details or modify the activity.
Once an appointment is created for a lead; you cannot invite Contact List entries to the appointment. You can however invite other leads or users.
Clicking the arrow button in a row will open the drop-down menu where you can complete or delete the activity.
Select the converging arrows to view the activities in a larger dialog box.