WordPress.org

1. Upload 'lastfm-RPS' directory to the '/wp-content/plugins/' directory
2. Activate the plugin through the 'Plugins' menu in WordPress
3. Go to Design->Widgets and Add "Last.fm RPS" widget on your desired sidebar.
4. Click to "edit" and insert your last.fm username and widget title you want to display in your sidebar
5. Thats all. Go to your main page and check if there's any errors. If you wrote your username right, then there shouldn't be any.

If your theme isn't widget-ready; you can insert the code like this :

<div class="sidebar">
<h3>My Last.fm</h3>
<?php lastfm_recent_sidebar([username],[songs to show],[timezone diff in seconds],[image position 'left' or 'right'],[The text at bottom of this widget])?>
</div>