It took me a while, and some help from Apple (one instruction I missed), but I finally was able to submit an app to the app store (still waiting for acceptance/rejection.)
But I went into xcode and started up the app again, and now I can’t run it on my iPad. I get a code signing error. It does run on the simulator.
I know it’s something simple…what am I missing?
-Rob
Sounds like you’re still using the distribution code signing identity.
Assuming you’re using Xcode 4.2, you can refer to the bellow image for how to change this:
[edit: better image]

You also need to change your application identifier to match your code signing identity:
So, look at the string next to the selection you choose in the step 4 of the first screenshot (probably something in the format of com.yourcompany.appname) and make sure to use that same identifier in step 4 of the second screenshot.