Code Sign error, How to switch an Xcode Project over to another Mac?

Question

I know how to use Xcode and everything but this is a beginner question. I just got a new MacBook Pro and I specifically got it for iPhone development. I transferred my main

Answer 1

(on the old mac) open "Keychain Access", select the category "My certificates", find the one that says "iPhone Developer: Your Name", click the triangle next to it and it should expand to show you your private key. Select both the certificate and private key, right click (control-click), select "Export 2 items" (or File->Export Items). Save them somewhere, copy the file over to the new mac, and double-click on the file to import it.