Need support for setting my facebook developer account

Hello, I have working C# desktop application with source code that is made for posting pictures and messages to facebook. It works but the only drawback is that the posting is made on a specific test page but I need to post it on another page. I need someone to help me to change the settings on Facebook and/or the application itself to make this possible. Basically there is no need to do any programming only make the right settings. Feel free to ask any question. Thank You