It sounds like all the index.php files in your WordPress install have been modified (maybe the plugin is buggy?). Typically WordPress has around 5 index.php files that run the blog (/index.php, /wp-admin/index.php, etc), plus another 40+ index.php files in the individual Themes (all in /wp-content/themes).
From your blogs Site Admin Dashboard, you can only modify Theme files, not WordPress's files. To modify the WordPress files, you would need to use a shell editor or FTP. Dreamhost provide a web-based FTP interface for browsing/editing your files:
Once you have access to your accounts home directory, I thinking you will see the following in the file techkumar.com/index.php:
* Front to the WordPress application. This file doesn't do anything, but loads
* wp-blog-header.php which does and tells WordPress to load the theme.
* @package WordPress
Just remove the div (and make sure the "<?php" is the first thing in the file, no newlines or spaces) and the feed problem should be fixed. Do the same thing in techkumar.com/wp-admin/index.php, etc.
Let me know if that helps.