FYI, to avoid any kind of future confusion, you may want to annotate that dependent on whether or not a member has altered their index.php file (if they are using a CMS such as vbadvanced and have renamed their index.php file to something else) that they will need to use the renamed index.php file in the link.
For example... [as per Step 2]
If Joe Doe's index.php file was renamed to forums.php, then their link would work as such:
Code:
<if condition="$vboptions['newsletter_switch']"><td class="vbmenu_control"><a href="forums.php?do=newsletter$session[sessionurl_q]">$vbphrase[nav_vbnewsletter]</a></td></if>