I need an app to rotate INSTAGRAM with..

[guiri]

Guys, I just bought a small asus tablet with keyboard so that I could get on instagram.
I have a product that I'm trying to promote and got the app just for that.

Someone helped me set it up and of course, I have to use a mobile device and a phone is too small for me.

Anyway, I have a problem. When I'm on instagram, it will NOT rotate it so it's horizontally which makes it a pain when I have the keyboard as the screen/orientation is SIDEWAYS so to speak and I have to type with my head tilted

It won't rotate and I even a rotating app but still nothing.

Does anyway KNOW of something that WILL work?
(If there IS an app that will work, I would much appreciate a link to it)

Thanks

George