You might be better off making your own thread and providing more detail of what the problem is and which page specifically you are trying to add information to.
From your post it's not even clear if the show you are trying to get credit for is on IMDB. Typically it would just be a matter of adding your credits to the show. But if the show isn't there that's a whole new set of info that needs updating.
If you are still having trouble submitting your TV Credits, can you clarify what Warning message you are seeing? Also, if you can obtain a screen grab of the page showing the Warning/Error, this will also be helpful if you can post it here.