Just copy past these line from you navbar template
and added in your header
<if condition="$show['member']">
<phrase 1="$bbuserinfo[username]">$vbphrase[welcome_x]</phrase>
<if condition="$bbuserinfo['pmunread']">
<a href="private.php?"><img border="0" src="images/newpm.gif" width="22" height="10" title="new message"></a>
</if>
<if condition="$show['pmstats']"> <phrase 1="$vbphrase[unread_x_nav_compiled]" 2="$vbphrase[total_x_nav_compiled]" 3="$session[sessionurl_q]">$vbphrase[private_messages_nav]</phrase></if>
<if condition="$show['pmwarning']"><br /><strong><phrase 1="$vbphrase[pmpercent_nav_compiled]">$vbphrase[your_pm_box_is_x_full]</phrase></strong></if>
<br />
<phrase 1="$pmbox[lastvisitdate]" 2="$pmbox[lastvisittime]">$vbphrase[last_visited_x_at_y]</phrase>
</div>
<else />
<!-- login form -->
<form action="login.php?do=login" method="post" onsubmit="md5hash(vb_login_password, vb_login_md5password, vb_login_md5password_utf, $show[nopasswordempty])">
<script type="text/javascript" src="clientscript/vbulletin_md5.js?v=$vboptions[simpleversion]"></script>
<table cellpadding="0" cellspacing="$stylevar[formspacer]" border="0">
<tr>
<td class="smallfont" align="left"><label for="navbar_username">User Name</label></td>
<td class="smallfont" align="left" colspan="2"><label for="navbar_password">Password</label></td>
</tr>
<tr>
<td><input type="text" class="bginput" style="font-size: 11px" name="vb_login_username" id="navbar_username" size="10" accesskey="u" tabindex="101" value="$vbphrase[username]" onfocus="if (this.value == '$vbphrase[username]') this.value = '';" /></td>
<td><input type="password" class="bginput" style="font-size: 11px" name="vb_login_password" id="navbar_password" size="10" tabindex="102" /></td>
<td class="smallfont" align="left" valign="middle"><input type="submit" class="button" value="Log in" tabindex="103" title="Enter your username and password in the boxes provided to login, or click the 'register' button to create a profile for yourself." accesskey="s" />
<label for="cb_cookieuser_navbar"><input type="checkbox" name="cookieuser" value="1" tabindex="103" id="cb_cookieuser_navbar" accesskey="c" />$vbphrase[remember_me]</label>
<input type="hidden" name="s" value="$session[sessionhash]" />
<input type="hidden" name="do" value="login" />
<input type="hidden" name="vb_login_md5password" />
<input type="hidden" name="vb_login_md5password_utf" /></td>
</tr>
</table>
</form>
<!-- / login form -->
</if>