Install Problem

I am using a style that apparently has modified this particular file.

I'm a bit of a novice and not sure where to change this requirement;

In this navbar-Template search for:

PHP Code:

<td class="vbmenu_control"><a href="calendar.php$session[sessionurl_q]">$vbphrase[calendar]</a></td> 


Below add:

PHP Code:

<td class="vbmenu_control"><a href="arcade.php?$session[sessionurl_q]">Arcade</a></td> 


This the the contents of my navbar file;

PHP Code:

<!-- breadcrumb -->
<div id="navbar-row">
<if condition="is_array($navbits)">
    <div class="navbar navbar-top"><a href="$vboptions[forumhome].php$session[sessionurl_q]" accesskey="1">$vboptions[bbtitle]</a> $navbits[breadcrumb]
     &raquo; <strong>$navbits[lastelement]</strong></div>
<else />
    <div class="navbar navbar-top"><a href="$vboptions[forumhome].php$session[sessionurl_q]" accesskey="1">$vboptions[bbtitle]</a></div>
</if>
</div>
<br class="spacer8" />
<!-- / breadcrumb -->

<!-- pm notification -->
<if condition="THIS_SCRIPT != 'private' && $show['member'] && $show['pmstats'] && $vbulletin->userinfo['pmunread']">
<table class="tborder" cellpadding="$stylevar[cellpadding]" cellspacing="$stylevar[cellspacing]" border="0" width="100%" align="center">
<tbody>
    <tr>
        <td class="panelsurround" align="center">
        <div class="panel">
            <div class="pm-new" style="width:$stylevar[formwidth]; text-align: center;">
                <phrase 1="$vbphrase[unread_x_nav_compiled]" 2="$vbphrase[total_x_nav_compiled]" 3="$session[sessionurl_q]">$vbphrase[private_messages_nav]</phrase>
            </div>
        </div>
        </td>
    </tr>
</tbody>
</table>
<br />
</if>
<!-- / pm notification -->

$_phpinclude_output 


Can anyone help? Thank you.