packaging my .app

I’m packaging my game for the mac app store using this tutorial i’ve got to section 3. which uses terminal, i assumed i just put that into terminal and changed his name with mine and his app with mine, terminal said ‘3rd Party Mac Developer Application: Beau Carrel: no identity found’ (beau carrel’s my name) what am i missing? what do i do with the certificate i got from apple? does my app need to be somewhere? its currently in my desktop, some help would be great! thanks in advance!

ok! sorted it, probably asked the question prematurely! don’t put in your computers name on the bath, just put applications - or wherever your .app may be, and in your info.plist make sure the CFBundleExecutable has .app at the end… or it doesn’t like it!!