1) Go to Settings on your iPhone/ iPad

2) Tap Passwords & Accounts

3) Tap Add Account

4) Tap Other

5) Tap Add CalDAV Account

6) Enter the following details for your account: 

 Server: To obtain the server URL may perform the below steps: 

 Login to cPanel -> Email Accounts -> Choose on the Email Account -> Configure Calendars and Contacts ->  Direct URLs for Calendars and Contacts         

 May get the URL from Secure SSL/TLS URLs or Non-SSL/TLS URLs on Calendar

 Username: Full email address 

 Password: Email account password


7)Tap Next in the upper right corner to verify the account.

8) Tap Save in the top right corner.