Open up the Gmail app, and click "Add new account, then click "Personal (IMAP) as shown, and tap "Next".
On the next screen, enter in your email address, and tap "Next".
Enter in your password and tap "Next".
Enter in the server settings as shown, making sure to enter in your own password in the "Password" field. Tap "Next".
On the next screen, you may customize the settings to your liking. Leaving them all checked is normal.
Fill in the account name ("Lingo Email" is a common one), enter in your own name, and tap "Next" to finish adding your account.