You can add a new contact manually from inside the Contacts area or on-the-fly when you are in an Event, Lead, Proposal, Invoice, Contract or one of several other tools that involve contact assignments.
To Add a New Contact from the Contacts Area:
This brings you to the Contact profile page, where you can add/manage additional information for this Contact, including:
From the Contacts area, you can also add new contacts in bulk by importing them from a file or importing them from another application.
To Add a New Contact On-The-Fly From Inside Another Tool:
Where you can add these on-the-fly depends on the tool and the process for that tool in assigning a Contact. For example, in the Events and Leads area, you add Contacts in the "Assigned Contacts / Manage" area. For Proposals or Invoices, it is when you add the Client/Lead. For To-Do's or Itinerary items, it is when you are assigning Contacts to the item.