yum command is not working

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http://forums.fedoraforum.org – hi friends ! I am newbie to fedora 16 . I used ubuntu before this jump. i have installed fedora just now . i need software packages which i used in ubuntu. to install vlc , i hit following command on terminal : $ yum install vlc Loaded plugins: langpacks, presto, refresh-packagekit You need to be root to perform this command. a) how do i become root in fedora ? b) I have given a password during installation.But the password is not prompted after hitting that command. I think my user account do not have or missing some administrator level previllages. Please help me to clear it . Procee (HowTos)