[blind-eddie]

To add a drop down to your navbar to show members subscribed threads could stretch down the page.
I would suggest just adding a link to a members subscribed threads which will take them to their subscribed threads page.

To add the link search in your navbar template.

Find:

		<td class="vbmenu_control"><a rel="help" href="faq.php$session[sessionurl_q]" accesskey="5">$vbphrase[faq]</a></td>

Add below:

                                <if condition="$show['member']">
		<td class="vbmenu_control"><a href="subscription.php$session[sessionurl_q]" rel="nofollow">$vbphrase[subscribed_threads]</a></td>
                                 </if>

But this very link is in the quick links dropdown already.