To configure your own domain (custom domain), you need to subscribe to our paid service. Any paid service plan is fine.
You can then logon www.drivehq.com, click on Online Storage & Sharing, then click on Publish --> Publish My Website --> Custom Domain. Follow the instructions there to configure your own domain name.
Please note DNS updates usually take 24 hours; so after you added a DNS A-Record, please wait for 24 hours.