Trouble Removing a Submit Button in an e-Learning Brothers' Storyline Game Template

I'm working with an e-Learning Brothers' template, "Speedway Game," that has a submit button appearing on two of the question slides. A learner selects the answer and then must click on the submit button to submit his or her answer; however, this is not required on the other 18 slides. On these slides, the learner is only required to select an answer, which is then submitted without having to also click on a submit button. 

Here is my issue: I cannot "find" the trigger for submit button, nor can I get to the layer with the submit button. Would anyone who has used this template before offer some insights? Thanks.

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