I am guessing that you have a droplet when you say “hosting”.

1) You’ll need a Floating IP (public IP) assigned to that DO Droplet
2) Go to you Domain DNS and add a new A Entry (for www. / *.yourdomain.com) using the Floating IP as Value for the A Entry.

Troubleshooting:

• If you’re not able to SSH to you Droplet then you probably have a problem with your firewall
• If you’re not able to telnet on port 80 / 443 from your local machine to the Floating IP that points to your Droplet then:
  • Make sure that your service is up and running (Apache / NGiNX etc.)
  • Make sure that your firewall is not blocking ALL 80 / 443 inbound connections.

If this doesn’t work please try to post more details, maybe we can help.