how can i enable google assistant on my samsung on5 pro

will on5 and on5 pro both will recive nougat as in my house i have both.... plz say samung

i want to know that how much stoarge does nougat take... so plz any j series or on series user those who have updated to nougat... can u do a factory reset and send me sceeenshot of your storage along with your device name....plz i have some question...

I want to know that can i keep my sd card as default storage like micromax device bcoz internal strorage is low.... currently using on5 help

I WANT S SECURE IN ON5 PLZ PROVIDE IT FAST.