How to upload .js function validateform()

<p>I am creating a donation page for a client and have placed a credit card form fill on the donate page </p>

<p>I have the .html form script sourcing a .js function validateform() file which directs the form inputs to the clients payment gateway.</p>

<p>The problem that I am having is finding the appropriate word press folder to upload my .js file to (through filezilla). This is the folder tree I have tried-

/public_html/wp-content/uploads</p>

<p>Note:The form currently accepts any info (even missing) and redirects to the returnvalidate url, this is why I think it is not recognizing the .js function altogether. Any suggestions are helpful!</p>