Using Alt+F2 to execute program from terminal

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http://forums.fedoraforum.org – Hello. Im trying to install a program with bitrock installer but im asked to logon as root or become super user. When trying to logon as root from logon window I get message that "cant authenticate user" Ive tried to find a place in "users and groups" to become superuser but cant find it. Please help. Regards Kjartan (HowTos)