IPhone problem connecting to App Store?

I'm trying to download a new app and when it says to insert my password when your apple ID comes but my email does not show up instead someone else's email shows up and i don't know who they are how do I fix it?

Open the Settings app, scroll down to iTunes & App Stores and tap it, tap Apple ID: (An email address) and tap Sign Out.
Now, it will ask you for an Apple ID and password.
Just put your ID and password back in and you're good to go.

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