authentication required problem

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http://forums.fedoraforum.org – Ok before You guys shoot me, yes i have searched the existing database for a solution and non of them were clear enough to help me out. So for the first time in my life i have installed an os thats not windows. I am also not a computer guru so any help you do want to give please keep it simple enough so an avarage joe would understand. So my problem is this. I installed F17 and just about the end of the installation i had to create a user account. It asked for a name, username and a password. I provided all the info and I was inside Fedora. Any change I try to make ask me for a Authent (HowTos)