Go to Google
and search inurl:/wp-content/plugins/easy-comment-uploads/upload-form.php
The next step is to pick your site on which you would like to upload your deface page. I'm gonna choose the first site that we see in the image.
The website should look something like the image above. The next thing you do is create a simple text file and write down your deface message in it and upload it on the website using the Upload button.
Now after it finished uploading the text file you replace the following line in the URL:
With this ( ex. uploads/2011/12/darkbyte.txt ):
uploads/[YEAR UPLOADED]/[MONTH UPLOADED]/sample.txt
Now browse to your Defaced site.
Feel Free to Thank me and give yourself a little Pat on the back also.