Hey just create your own admin/index.php page and paste in the following code:

Code:
<HTML>
<HEAD>
<title>{$site_name} - Admin </title>
<META http-equiv=Content-Type content="text/html; charset=utf-8">
<link href="{$baseurl}/templates/css/admin.css" rel="stylesheet" type="text/css">
</HEAD>

<BODY bgColor=#ffffff leftMargin=0 topMargin=0 marginheight="0" marginwidth="0">

<CENTER>





<FORM id=_ctl0 name=_ctl0 action="index.php" method="post">

<DIV id=mainbody>

<TABLE cellSpacing=15 cellPadding=0 width=650 align=center border=0>

<TR>
<TD vAlign=top width="55%">


<TABLE cellSpacing=0 cellPadding=2 width="400" bgColor=#dddddd border=0 align=center>
<TR>
<TD>

<TABLE cellSpacing=0 cellPadding=5 width="100%"  bgColor=#FFFFFF border=0>
<TR>
<TD>
<TABLE cellSpacing=0 cellPadding=5 width="100%"  bgColor=#FFFFFF border=0>

<TR>

<TD colSpan=2 align=center>Login</TD>
</TR>

<TR>
<TD colspan=2>
</TD>
</TR>

<TR>
<TD align=middle colSpan=2>Enter your username and password to log in </TD>
</TR>

<TR>
<TD class=bk align=right width="30%">Username</TD>

<TD><INPUT class="field" id="username" size="25" name="uname"></TD>
</TR>

<TR>
<TD class="bk" align="right" width="30%">Password</TD>
<TD> <INPUT class="field" id="pass" type="password" size="25" name="pass"></TD>
</TR>

<TR>
<TD></TD>
<TD><INPUT class="bttn" type="submit" value="Log In" name="login">   Lost Password

</TD>
</TR>

</TABLE>

</TD>
</TR>
</TABLE>

</TD>
</TR>
</TABLE>

</TD>
</TR>
</TABLE>

</DIV>

</FORM>

</CENTER>
</BODY>
</HTML>