Hi Helpme-pls,
Since you're unable to add an email account to your iPhone, we recommend that you try the steps here: Add an email account to your iPhone, iPad, or iPod touch - Apple Support
Next, we’d like to show you how to perform the recommended troubleshooting steps via the link above. Please click to open the link, then read through the steps in the section titled "How to set up your email account automatically."
If you use an email provider like iCloud, Google, or Yahoo, Mail can automatically set up your email account with just your email address and password. Here's how:
1) Go to Settings > Mail, then tap Accounts.

2) Tap Add Account, then select your email provider.
3) Enter your email address and password.
4) If you see Next, tap Next and wait for Mail to verify your account.
5) If you see Save, tap Save.
If you don't see your email provider, tap Other to add your account manually.
The reason why we are recommending the steps above is because they will show you how to add an email account to your iPhone.
If you’re still experiencing the same issue, then give the steps here a try: If you can’t send email on your iPhone, iPad, or iPod touch - Apple Support
If the original problem persists after trying the previous steps, please provide us with specifics on what you see for more help, and we will continue from there.
Thanks for using the Apple Support Communities.
Cheers!