Since you are having some issues in order to set up your Slingbox when running the Mobile application on the iPad, there are some details you must know.
First, you need to run the Setup Assistant for Internet Viewing at the Slingbox location. This link will provide you with the steps to follow.
Once you finish this process, you only need to launch the Mobile application on your iPad and get the remote connection. The following link will provide you with all the information about the SlingPlayer Mobile application for the iPad.
Make sure to follow these indications and let us know how it works for you.