Rooting noob fails HELP!?

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http://forum.xda-developers.com – OK so the goal is to get a CM10 nightly build on my Asus transformer prime What i have done so far is unlock the device via downloading the Asus utility to my prime, that seems to have worked fine. Here is where i think everything went wrong, I installed sparkyroot on my prime, it seems to have worked fine but when installing superuser app i see "su file does not exist or have correct permissions" but i went and installed the app anyway. Now im stuck at rom manager app on my asus, when i open the app i get "you must root your phone for rom manger to function" superuser (HowTos)