Another way to find Gmail email address from the desktop website or the official Gmail app is to select your profile image at the top right. If you're on a computer, this shows the email account you're using right now and any other Google accounts you're logged in to in the current browser session.

Type in your username and password. Once you've opened the web address of your email provider, you will see a login page. Enter your email account's credentials (username and password) in the text fields provided. If you forgot your password, you can usually click the "Forgot Password?" link to reset it.

See all settings. Click the Accounts and import tab. In the "Check mail from other accounts" section, click Add a mail account. Type the email address of the other account, then click Next.