You can open a console, and do this:
CODE
su (enter root password when prompted)
now, if you want konqueror running in root, you can then just type:
CODE
konqueror
of course, you can also click the star, and then click Run. Then type konqueror, and click the box to run as a different user, then type root and the password.
Alternatively, just type:
CODE
kdesu konqueror
and kde will prompt you for the root password. So, you can do with the gui as a normal user, and still run apps as root when you need to.
I re-iterate, running as root, you are heading for troubles when you screw something up. And as a newbie, you will most likely do it too since newbies don't really know what they're doing.
So I guess, that's one reason not to run as root.