What is there to not understand?
You have a name, last name, you live somewhere (address) and if it's bigger place, you need the apartment suite/unit/floor stuff
You also live in somekind of city area and it's in a state (might be left out if you pick something besides US, which might also mean you'd be ineglible for it since a LOT of online rewards specify "must be US citizen"
and you also have ZIP/postal code.
They ask said things supposedly so that single person wouldn't create lots of accounts and/or try to get free "money" aka zsilver.