InfoPath Dev

 Thank you so much. I was almost there, but this clarified the hide part. Thanks!!!!

 I'm sorry I don't understand your reply.

 I need to create a submit button on form but once the form is submitted to my SharePoint Library and it is opened up by staff I want the submit button to be disabled or disappear.  How do I do this simply?  Very frustrated with what I can find on internet as answers hoping you can help.