How to change IGN in play store? Before, I had a coc acc and I got bored so I gave my acc (gmail) to my friend. My friend then changed the ign to his name. Now that i got a new phone, I installed coc and even if my old acc is already installed, i cannot play my old acc and his ign appears at the top. How can I change my ign?  Do I need to log out my acc from his phone?
To change your IGN


Open Google Play Games.
Tap the IGN
Tap on the Pencil in the top right 
Change the IGN.