Unfortunately, your post is not clear enough and we need you to give us as much information as possible. Did you already install the application from the iTunes store? Do yo get any error message when you attempt to connect?
After you install the application in your iPad, and if the Internet Viewing is enabled in your Slingbox, you should be able to connect to the Slingbox locally and remotely with your iPad 2.
You can find more information here,