Step::1 Login to WHM Interface.
Step::2 Scroll down to the Plugins option and open it.
Step::3 Click on Softaculous- Instant Installs.
Step::4 Click on General option under Settings.
Step::5 Go to Rebranding Settings and fill the Options: Site Name, Logo URL, Favicon Logo URL etc.
Step::6 To Finish click on Edit Settings button.
That's It !
Check out the video tutorial to get in detailed procedure for the same. You may also go through the blog.