Log with your Hostpoint ID into your Control Panel and go to "Domains" at the top of the page.
The overview shows a list of your domains. Click on "Edit" under the desired domain.
You now see the field "Domain state" and select the option "Redirect domain (HTTP Redirect) to".
Enter the desired address in the field below and save the settings.
The redirect will be active after 5 – 10 minutes.