The public and client-facing areas of WHMCS are white-labelled, meaning that your visitors will not see reference to the WHMCS name.
Licenses provided via resellers may display a "Powered by WHMCompleteSolution" branding link-back to visitors.
This line can be removed by upgrading from Starter to Plus tiers or above. The process is seamless, please contact your license reseller directly to arrange an upgrade.
If you are a direct WHMCS customer and see a "Powered by WHMCompleteSolution" link on public and client-facing pages, it indicates that your WHMCS instance is being used at an unlicensed location.
Please access your WHMCS Admin area from the Valid Domain, Valid IP and Valid Directory combination specified on your license, and the link-back will clear immediately.