Theme Functions (functions.php) code messup

While trying to install a plugin that shows random images (http://meandmymac.net/plugins/randimage/), I accidentally changed something in line 2 of the WordPress Default template, Theme Functions (functions.php).

RandImage asks that the users to “insert this code in your theme”:
<?php randimage_sidebar(); ?>

I guessed (wrongly?) that this meant that I should add the code to the Theme Functions (functions.php) code. I did so, in line 2, but it didn’t work. So I tried removing the < and > and fiddled a bit back and forth with this, and now all I get is this error message:

Parse error: syntax error, unexpected ‘<‘ in /customers/lc-norway.com/lc-norway.com/httpd.www/wp-content/themes/default/functions.php on line 2

Unfortunately, I can no longer access the functions.php page to correct the error. I guess I’ll need to upload the unaltered original file to the webserver and try again.

But – where exactly SHOULD the RandImage code <?php randimage_sidebar(); ?> be placed? Did I choose the wrong file to put it in? Or did I choose the right file but add the code at the wrong place?