How to change text and pictures in pre-existing triggers

I am a very new user to Storyline 2. I am using a pre-existing template, which contains a slide with pre-existing triggers. I would like to keep the basic format, but would like to change the pictures and text, but it is locked. The only way I can change the text or pictures is to delete the trigger box, but I am such a novice that I lose much of the attached formatting. I have attached a screenshot file of the screen I am trying to edit/modify.

Thanks so much!

 

 

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