How to display HTML after dropdown selection

lt ltempest 30 May, 2018
Hello,
Please view the attached screenshot. I have a dropdown with various select options and I'm just trying to work out the logic before adding all the other events.
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What I would like to happen is for an additional text box to be displayed depending on the dropdown choice selected. I have the text box hidden with CSS on page load using the class and display:none.

What have I done wrong?
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Thanks
Lee
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How to display HTML after dropdown selection image 1

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