Why does the new Gmail address not show on the Samsung tab 2 version 7.0? A friend forgot her primary Gmail address so I created a new one for her. The reason she could not find it was her surname was wrong. The problem is that when I press the Gmail icon on her Samsung tab 2 version 7.0 only the primary email inbox is shown. I have found no way to view the new Gmail address which she needs to open to confirm something she did on the internet.

Is there any solution given on the web, perhaps from Google? I completely fail to understand why Google will not allow us to change what the primary address is. We shall never use the one Google has decided upon against our wishes. The only inbox we are interested in opening is that of the new Gmail address I have just created.
Go to your phone's Settings. Under Accounts, add the existing Google account. After you go through the wizard (and making sure email is synced), go back to the GMail app. When you trigger/click the hamburger menu, you should be able to select between your different GMail accounts.