Re: how can i change my email address that i provided during play store run for the first time?
Welcome to Android Central! The email address is the one that is associated with your Google account, which I don't believe you can change once you've set up your account.
Why do you think your email address is the problem? What happens when you try to install an app from the Play Store? Which device do you have? Are you sure you have a valid credit card associated with your Google Wallet? Does this happen on both wi-fi and mobile data? If on wi-fi only, does it happen on different networks?