Once you have logged in you will be able to view your contacts and create new ones, as well as open a new case and view or edit any open cases you may have.
Your contacts page will look like the following:
To add a new contact simply click New in the top right and enter all the details of your contact.
At the end of the page there will be a checkbox which will allow the contact you are creating access to create new contacts.
Ensure you select Save to update your changes.