In Address Book you can add single contacts by adding a new contact in a current group or by adding a group without contacts, and then add a new contact.
This flow describes the latter. To add a single contact to a present group, please see step 3.
- In the main overview, click on + Add.

- Type in a name for the contact holder / group and click on Continue

- When in the new group, click on + New contact

- Fill-out the contact’s details and click on Save