From WHMCS Documentation
Certain parts of the administration area of WHMCS are customisable in the same way as the client area. As of version 3.6.1 the following areas can be customised:
- The drop down navigation menus: topmenu.tpl
- The administration dashboard/homepage: homepage.tpl
- The left-hand statistics panel: navbar_statistics.tpl
- The clients summary page: clientssummary.tpl
These files are all located in the admin/templates/ directory, relative to your WHMCS installation's root, which also contains style.css so you can customise the appearance and colours of your administration panel.
See also Template Syntax
