Hi Chris,
That should be fairly easy. Edit your form, switch to the Form tab and let it generate a generic table layout, unless you already have it customized. Then wrap the label (specified by something like $$label:fieldname$$) in an anchor tag.
Here's an overview of the Form tab: http://devnet.kentico.com/docs/devguide/index.html?defining_custom_form_layout.htm
I see your label looking like this
<a href="~/terms.aspx">$$label:termsandconditions$$</a>
You would do this the same way with document types or custom tables.
Cheers,
Dave