You can view and manage your contacts by navigating to Contacts from the left-hand panel.

To add an individual contact, select Actions -> Add Contact and choose the group to which this contact should be added. Then, add the contact's details and submit the form.

To edit or delete a contact, click the edit/delete button in the row in which the contact is displayed in. You can also send a message to an individual.

Also see: 

• How do I add a campaign group and what is it used for?

• How do I set up an outbound campaign to my target group?