Once downloaded, follow the steps below.
1. Click on + icon -> Add Account
2. Click on "Login with URL and user name"
3. Enter the below details:
Base URL: To obtain the server settings, 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
6. Click on LOGIN
7. Tick on "Calendar" option under the Caldav section