You can look at the source code for the theme you’re using in the Editor (look in the sidebar under appearance). If the search bar is in the sidebar (as it usually is), then look in the file “sidebar.php”. What the code looks like depends on the person who wrote it, but it should be something like this:
<form action="http://wordpress.org/search/do-search.php" method="get" id="head-search">
<input class="text" name="search" type="text" value="Search WordPress.org" maxlength="150" onfocus="this.value=(this.value=='Search WordPress.org') ? '' : this.value;" onblur="this.value=(this.value=='') ? 'Search WordPress.org' : this.value;" /> <input type="submit" class="button" value="Go" />
</form>
If you see something like that, then the search bar is coded in. You can remove it by deleting the code, or you can comment it out (by putting <!-- in front of it, and --> at the end).
If you’re not comfortable with editing code yourself, you can always post a link in this thread to the theme you want to use. I or someone else should be able to tell you if that theme has a search bar coded in, and what to do about it.
