how do you stop images/pictures from turning sideways on iphone 6 plus

Hello sleperry,

Thank you for using Apple Support Communities.

It sounds like you are wanting the screen orientation setting. You can use that setting to prevent the screen from turning sideways.

From the iPhone User Guide for iOS 8.1 (pg 23) :

To lock the screen in portrait orientation, swipe up from the bottom edge of the screen to open Control Center, then tap (lock with circle arrow icon).

The Portrait orientation lock icon (lock with circle arrow icon) appears in the status bar when the screen orientation is locked.

manuals.info.apple.com/MANUALS/1000/MA1565/en_US/iphone_user_guide.pdf

Regards,

Jeff D.