If you are using an on-premises deployment of Domino, Domino’s white labeling features allow you to “re-brand” your Domino interface with your organization’s own identifying marks, by adjusting three specific settings. These settings are controlled through Central Configuration, which is accessible via the Admin page (Advanced > Central Config).
com.cerebro.domino.frontend.footerCustomization.customContactUsHref
This setting specifies what happens when a user clicks the "Contact" link at the bottom of the left-side navigation panel. (Note that this navigation option is only visible when a user is in a project.) The value can be set to a URL to direct users to a web-based form, or to an email address (mailto:support@domain.com) to trigger the user’s email client to send an email.
For more information, read our documentation on on Central Configuration.