Tap New and then tap Person as shown, if you're using a phone then you may need to first tap
A household is just like a real life household, and adding this info will help you gain a better understanding of people's family unit. A household can contain a single person, a group of young singles, newlyweds, mom; dad and three kids, in fact however their family is structured you can add them to the right household.
Tip: If the last item you viewed was another household then you will need to tap New household.
The side panel is displayed on the right hand side of the page, if you are viewing on device with a small screen such as a tablet or phone you can access it by tapping
Import and duplicates
If the details of the household you have entered is a possible duplicate of existing household then you will see a list those possible duplicates on right, this will include deleted households which makes it easy to undelete households and get back all the people you had prior to deletion of the household.
There is also an option to import multiple people from a spreadsheet.