Go to your blog backstage -> Appearance -> Widgets -> Drag a new Text to Sidebar -> copy the following code and paste to it:
--------------------
<form method="get" action="
http://www.google.com/search">
<div style="border:0px solid black;padding:4px;width:20em;">
<table border="0" cellpadding="0">
<tr><td>
<input type="text" name="q" size="30"
maxlength="250" value="" />
<input type="submit" value="Google Search" /></td></tr>
<tr><td align="center" style="font-size:100%">
<input type="checkbox" name="sitesearch"
value="
URL of YOUR BLOG" checked /> Station Search<br />
</td></tr></table>
</div>
</form>
-------------------------------
just change
URL of YOUR BLOG as your site (e.g.
www.-------.net)
Some parameters like size, adjust yourself.