The installation / removal of whmXtra is easy
To remove WHMXtra do the following from the console :
# wget http://whmxtra.com/pro/remitall.sh;sh remitall.sh
To install WHMXtra do the following ,
# wget http://whmxtra.com/pro/pro.sh;sh pro.sh
Now logins to WHM -> Plugins and continue with the installation procedure
for u for Admin 