Set up an email account on your iPhone, iPad, or iPod touch

iOS 11 changed the email setup steps for adding email to devices

Go to:

1. Settings > Accounts & Passwords > Accounts

2. Under Accounts pick account by name (iCloud, Google, Yahoo)

3. Tap Next. Mail will try to find the email settings and finish your account setup. If Mail finds your email settings, tap Done to complete your account setup.

Email setup for older versions of iOS prior to 11

Go to:

1. Settings > Mail > Accounts > Add Account.
2. If you see your email provider, tap it to add your account automatically. If you don't see your email provider, tap Other to add your account manually.
   

Set up an account manually

Make sure that you know your email settings. If you don’t know them, you can look them up or contact your email provider. Then follow these steps:

1. Tap Add Account, tap Other, then tap Add Mail Account.
2. Enter your name, email address, password, and a description for your account.
   
3. Tap Next. Mail will try to find the email settings and finish your account setup. If Mail finds your email settings, tap Done to complete your account setup.

*Referenced from Apple Support -  for further support from Apple use this link

https://support.apple.com/en-us/HT201320