On your iPhone, tap the Settings app to open it.
Tap Passwords & Accounts (this is on iOS 12. On older versions of the iOS, you’ll want to look for Mail, Contacts Calendars. The other steps are slightly different, but the basic concepts still apply).
Tap Add Account.
Tap the type of account you want to add. (For BLS Webmail you would select 'Other')
5. Select the option you know is related to your email you're adding (E.g. domains ending in @Gmail you'd use gmail, same for hotmail and yahoo. For those you'd just need to input your password and email)
6. Input your email details, if you're unaware of these contact your email host provider