Search for "<div class='post-footer'>" and past the code just below it
Log into WordPress.
Click on "Design" and then "Theme Editor".
Choose the "Main Index Template (index.php)" from the list of Theme Files.
Search for where your entry meta data (tags, author, etc.) is displayed. For example you might find "<div class="entry-meta">". Paste the code just below it
Repeat for every other Theme File that contains posts (archives.php, search.php, single.php, etc).