Welcome to the forums.

Without knowing what skin you are using, or having a link, it's a tad difficult however...
in your skin folder look for this code in either index.main.php, post.main.php, page.main.php or single.main.php

Simply comment it out or delete it.
Remember, while you play with those files, always make a backup.
Good luck.

<?php
				$Item->issue_time( array(
						'before'      => /* TRANS: date */ T_('on '),
						'after'       => '',
						'time_format' => 'M j, Y',
					) );
			?>
			<?php
				$Item->categories( array(
						'before'          => ' | '.T_('In '),
						'after'           => ' ',
						'include_main'    => true,
						'include_other'   => true,
						'include_external'=> true,
						'link_categories' => true,
					) );
			?>

Thanks for the response! I'm using a template called Green Fields - I believe I got it off another website. I don't remember if that was the exact original name.

I have an index.main.php but I don't have a post.main.php, page.main.php or single.main.php. Do I just create these files and edit the code like you said in page.main.php?

Yep, give it a try :)
Remember, keep a backup

Success! I deleted that part of the code and it worked. Thanks!

I used the directions above was able to delete the category after the post. But now I would like to change the wording from "Send feedback" to "Leave a comment". How can I do that? I am using the skin Tsokolate. I can't find the words "Send feedback" in any of the files.
Thanks for any help.

Look in your /skins/yourskin/ folder *.main.php file for a function that looks very much like the one in http://forums.b2evolution.net/viewtopic.php?p=93211#93211 and make your 'type' be 'comments' instead of 'feedbacks'.

* because there could be index or pages or posts or single or heck lots of different .main.php files - each doing a different type of page.

Thanks so much. I'm really learning at lot.