How do I make a link Prefill values into a form

I’d like to have a link that will prefill "FillValue" into a form text input.

The HTML is:

<input name="input_93" id="input_18_93" type="text" value="" class="medium" aria-invalid="false">

For some reason when I click the link it will not prefill "FillValue" into the input field.
What am I missing?

I tried using the Name input_93 and searched the page source for JavaScript and keep getting the same results.

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