How do I aspect ratio.

on the site:

"For example, instead of 1280x720, target the 16:9 aspect ratio. (Just enter any 16:9 resolution for the window size in Project Properties.) "

1280x720 is already a 16:9 aspect ratio, so if 1280:720 is already a proper aspect ratio, do i use that? or how do i enter 16:9 ?

How do i account for phone rotation, and make it 9:16 if someone tilts their phone?

scirra.com/tutorials/1042/h ... ize?page=1

If you don't lock orientation, the game should flip when the phone is flipped.