Edit a Timer to Show an Element on the Page

Hi, 
I'm currently trying to create a show and hide interactive, but I want to make it, so on load it's hidden, but then once you click a button it shows, and stays visibile forever. Currently when I use the show/hide actions, then I navigate back to the page, the element hides again. 
To get around this I've been using variables, set to true, and then the element shows when the variable is true. This seems to hold even when going back to the page, but it's a ime consuming process. Having to ...

How do you trigger a show action for an icon that is on one page, but the trigger action is the completion of another page? 

I selected the page > clicked Trigger > When this page is completed > Show Action > then the only items I can select are on the same page that I am using as a trigger. I can't figure out where to select an image on another page to show on completion. The search only returns items on the same page, too.

Do I have to create a custom variable or am I missing ...

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Scenario:

We're using a single in-line text input field with an associated variable (per screen) instead of the standard Short Essay question template (we have reasons for not being able to use the template, mostly to do with being unable to disable the default template pop-ups)
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General Timer Control Options