I have just upgraded to Cyan and im using 520 lumia.... By mistake I've unpinned the "Messaging" tile from home screen now I cant find a way to pin it back..Help!
On the start page, swipe the screen to the left (or tap the rightward facing arrow at the bottom right of the start screen). This leads you into the main app list.
Scroll down until you get to "Messaging". Then tap and hold that app, and then choose "pin to start" from the pop-up menu that appears.