Edit my app so that I can change servers

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Job Description

My app is Training Grounds Jiu-Jitsu & MMA. It is a web app that uses a backend server hosted by bluehost here http://mma-in-nj.com/iphone/test/admin/login.php.

I want to change servers but it will need some edits within the app itself so that it points to the right server. Additionally the image gallery is broken for some reason and needs to be fixed