Crazy Domains offers a number of basic POP/IMAP email only services at low-cost. These low-cost services usually exclude a hosted calendar service.
If you want to stay with Crazy Domains, but get the benefits of a hosted calendar service, you can easily upgrade from Crazy Domains Email Hosting to Crazy Domains Email Exchange.
Crazy Domains Email Exchange is a business-grade Microsoft Exchange service, including hosted calendar service, managed by Crazy Domains.
Once upgraded to Email Exchange, you can follow the Microsoft Exchange calendar sync instructions at: http://help.lawtap.com/connect-your-calendar-to-lawtap/how-do-i-connect-my-calendar-to-lawtap
If you do not want to upgrade, you will need to follow the DIY instructions set out at: https://help.lawtap.com/connect-your-calendar-to-lawtap for Syncing POP3/IMAP Outlook Email Between Your iPhone or Android and Computer.