Unsure how to use oneditprepare

I have solved my own problem, I am not familiar with boards like these so sorry if I have added clutter to the board. Since I have already posted this though I may as well post the solution. It took me a while to find the answer and it seems to me that there wasn't much easy to find documentation on it, so I'm hoping that anyone else having the same issue that I did will run into this post and have an easier time than me.

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