Open the project. In the project directory, select the project navigator. It should display some folders for your source files, as well as two at the end called "Frames" and "Products." Double-click the Products folder to expand it. There should be an entry called foo.app. Where foo is the name of your project. Select an entry for foo.app.
In the attribute editor, look at the top. An entry called "Full Path" appears. It should point to the full path of your application.
For example: /Users/myself/Library/Developer/Xcode/DerivedData/InternationalMountains-gxduphnptzmjqsbmpnqxhxansikq/Build/Products/Debug-iphoneos/InternationalMountains.app
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