"Su error for kde"

Hi all, i'm newbie in linux, and i choose knoppix as my first linux. ([sorry for my bad english])

I've some troubles that i hope u help me to resolve...

I've installed knoppix 5.1 (dvd) on my hard disk (in a notebook dell), succesfull configured lan and wireless (!!!) and now i'm writing on knoppix...but...

1) when i try to open some kind of software (probably software that needed root privilegies) i receive an erro: "Su error for kde"...do u know what's the problem?! (for other softwares shows me to put root password, but other softwares show me this error)...


Thanks guys,

before use su from kde you must edit sudoers file ..

login with su and edit /etc/sudoers with visudo command



thx