xcode4.2 for lion does not know how to set up

rt, brother of developer certificate have, but do not know how to set xcode, find some information that is in the Project -> Edit Project Settings to configure some inside information, but I did not find this option
Which guide us! Thank you!
Reply:
Which help with xcode4.2 for lion fought packages Manga
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Select the items you have to have the window open --- ----- Build Settings ----- Code signing --- set here certificate
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project --- Get Info --- Build Settings