In the account bar at the top, click on the "+Contact" button.

Once you click the +Contact button, you will be taken to a page where you can fill out the contact's information.

You can enter in the source of the lead, share it with a team member or co-marketing partner, add general notes, add groups and more.  Click “Save” at the top when you are finished.

Importing Contacts

Contacts may also be imported to your account through a .csv spreadsheet file.  Please read this article for more information.