What I understand from your post, is that you're having problems adding the Slingbox to your iPad.
The port that you need, is the one that you used during the Internet Viewing Setup (5001 by default).
Now, you can create an Sling Account to be used as a login from the iPad, that will pull all the Slingbox information automatically.
To create the account go to www.slingaccounts.com.
Besides that you can use the following link