Modifying how posts are displayed when a category is clicked

I have categories listed in my sidebar and when I click one of the categories I only want the title of the posts to be displayed.

I have found this:
http://wordpress.org/support/topic/93046

That post basically refers here:
http://codex.wordpress.org/Category_Templates

On the wordpress codex page is talks about displaying expercts instead of full posts. It also says to find where is says the_content() and replace is with the_experpt() inside a loop somewhere. I searched both my category.php and my category-template.php and there is no content() or excerpt(). I also dont even have an archive.php.

They might have changed things with the new wordpress.

How can I make it so it only shows the titles of each post when a certain category is clicked?

Thanks Ahead
-Feroze