If you wish to manually set up your email account, you must first acquire the relevant information, such as server settings. You may get this information using the Mail Settings Lookup tool on the Apple Support page, or you can contact your email provider or carrier. Once you've completed these steps, you're ready to go:

1. From the Home screen, choose Settings.
2. Select Accounts & Passwords from the drop-down menu.
3. Select Add Account from the drop-down menu.
4. Select Other.
5. Then select Add Mail Account from the drop-down menu.
6. Fill in your name, email address, password, and a brief description of your account.
7. Next should be tapped.
8. Allow the Mail program to attempt to locate the email settings and complete the email account setup. Tap Done to finish the procedure if the app discovers your email settings. Otherwise, you'll have to manually input the settings again. Here's what you should do in this situation:
9. For your new account, choose between IMAP or POP3. If you're not sure which one to use, contact your email provider.
10. Fill in the details for both your incoming and outgoing mail servers.
11. Then press Next.
12. To conclude, press Save if your email settings are correct. You'll be prompted to modify them if you don't.  Contact your email account for further assistance in case you’re having trouble with the email account set up especially with the server settings.
13. After you have successfully set up your email account, try to create a test email to see if you can send and receive the email on your iPhone as intended.