Home Page Summary

Hi. I want my homepage to display only summaries. I have read other forum posts on a similar topic but they don’t help me. In those forums it says something like “in /wp-content/themes/{themename}/index.php find this

the_content(‘… stuff is here …’);

change it to this
the_excerpt();”

however, my index page does not include this info. I am using wordpress twenty eleven theme. Here is my blog page http://www.madeinthai.org

Thanks in advance for any answers!