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Open Gmail on your Android. Tap ☰. Tap your profile picture. Tap Add account. Select an email provider. Enter the email address you want to add. Tap Next. Enter your email password. Tap Next. Tap I AGREE. Switch between email accounts.

Article:
It's the red and white envelope icon that's usually on the home screen. It's at the top-left corner of the screen. It's near the top-left corner of the menu. The menu now displays fewer options.  If you're adding another Gmail address, select Google. Otherwise:  If your email address ends with outlook.com, live.com, or hotmail.com, select Outlook, Hotmail, and Live. If you use Office 365 or the Microsoft Outlook application for email, select Exchange.  Tap Yahoo if you have a Yahoo! Mail account. If you have a POP or IMAP account, see this method.  This brings you to the password screen.  Once your password is authenticated, you'll be signed in to the account. The text may vary by account, but you'll usually have to give the Gmail app permission to access your messages. Once you're finished, your new account is ready to use. Here's how you can switch between mailboxes to view all of your mail:  Tap ☰ at the top-left corner of Gmail. Tap the down arrow to the right of your username. Select the account you want to use. This opens the inbox for that account. You can send and receive messages from the new account on this screen. To switch back to the other account, tap ☰, tap the down arrow, and select that account.