You wanted to download or access an existing app yet somehow you found yourself in the flow of creating an app.  Not to worry... here are instructions on how to access the app:

Visit the my.yapp.us URL you were given by your app creator.  For example, http://my.yapp.us/CONFDEMO.  Once you have Yapp installed, tap "Download an Existing app."  To see a video of how to install your app and for more information, checkout this article on downloading your app.
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If your app creator marked the app as private, you will need to create and authenticate a Yapp account.  View this article for more information on accessing private apps.

If you would like to unsubscribe from the app creation related emails, simply go back to your original email and hit the small "unsubscribe" link in the footer.