To change your email address, sign in to your account and head to menu in the upper, right-hand corner. Click on your email, then click on it again in the next view. After this, it will give you the option to add another email. You must verify your email. Once it is verified, then you can make that one your primary and delete the other.
*Please Note: Only the primary email address on your account has permissions for things such as signing in and resetting your password. Any secondary emails on the account cannot be used for those things.