Unable to Uninstall m2e plugin frm eclipse

Sir,

Had installed m2e thinking, its easier to handle.But its been very confusing.I want to uninstall it &
continue with mvn from cmd prompt as you discussed in maven tutorial.

[b:3fnfjdjz]Qurey: Am unable to uninstall m2e plugin from eclipse."uninstall " button is disabled.
Is there an alternative way to uninstall it sir ?[/b:3fnfjdjz]

Reference:
http://stackoverflow.com/questions/2452040/how-do-i-remove-m2eclipse-from-my-eclipse-installation

Screenshot attached...