Add href to DUA generic link

fence/templates/register_user.html

@@ -30,7 +30,7 @@ <h1 class="introduction">Register* in order to get access to download data</h1>
       </li>
     </ul>
     <button class="button-primary-orange" type="submit">Register</button>
-    <p>By registering and submitting this form, you hereby acknowledge and consent to be bound by our terms and conditions, and our data use agreement (DUA), both of which can be found on our main website, or on our data access portal. </p>
+    <p>By registering and submitting this form, you hereby acknowledge and consent to be bound by our terms and conditions, and our data use agreement (DUA), both of which can be found on our main website, or on our <a href="/dashboard/Public/documentation/DUA.html">data access portal</a>. </p>
   </form>
 {% endblock %}