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New installation

• Unzip into your /wp-content/plugins/ directory. If you're uploading it make sure to upload the top-level folder. Don't just upload all the php files and put them in "/wp-content/plugins/".
• Activate the plugin through the plugins menu in WordPress
• Open comments.php and search for "<textarea". Check the id of the HTML tag. It has to be "comment" (id="comment"). This is WordPress standard.
• Paste following PHP code in the line before "<textarea ...": <?php if (function_exists('quicktagzmilies')) { quicktagzmilies(); } ?>
• Save and upload comment.php. The quicktagbar should now appear in your comment area
• Go to Quicktagzmilies options in your admin panel (Settings » Quicktagzmilies) to customize the plugin

Update from 1.0.1 to 2.0 (this version)

• Download this plugin
• Delete wp-content/plugins/quicktagzmilies/qtz.js.php, wp-content/plugins/quicktagzmilies/qtz-admin.php and wp-content/plugins/quicktagzmilies/qtz-functions.php
• Upload the files quicktagzmilies/quicktagzmilies.php, quicktagzmilies/quicktagzmilies-admin.php and quicktagzmilies/quicktagzmilies-js.php to wp-content/plugins/quicktagzmilies/
• Reload front- or backend and it should work

Please check Quicktagzmilies page for further information