My instagram app still won't open?

I tried resetting my phone like people said didn't work & delete the app to & downloading it again still not working also log off the Wi-Fi didn't work also any other suggestion please 10pts it's a iPhone 4 I got

Okay, lets see if this works. Log out of your Apple ID in the iTunes store then log back in. Now, try installing the application.

My instagram won't open

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