Changing java script values to upperCase isn't working

I am making an input value a variable in my java script code. When I use the value.upperCase() when I run it the text isn't upper case it just says "function toUpperCase() { [native code] }" but not in the error just as the header

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Answered by Coder100 [earned 5 cycles]
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@DotExe well now im getting this error
TypeError: Cannot set property 'innerHTML' of null
at solveSq (/:305:55)
at controlsCheck (/:258:11)
at HTMLButtonElement.onclick (/:112:166)