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Are you referring to the text label in the Drag and Drop upload widget?
In the screenshot above, you see I added a "Click Here" which is clickable, if that's the part you want to add a hyperlink, you can do that by just adding <a target="_blank" href="link here" >Click Here</a> in the "Text" field in your widget settings/properties.
However, please note that when you edit the text again, the HTML code you added to hyperlink it will disappear and you need to add it again.
Here's a sample form where I applied the trick: http://form.jotformpro.com/form/52292340586962.
I hope that helps.