Aha, I see you sneaking in over there… so you want to know how to list the categories of each post, with the respective post.
No problem! Go to the template wherein you wish this magic to occur, and locate your {exp:weblog:entries… } code.
Decide where you want the category list to go (near the posted by line is pretty common) and insert this code:
Filed under {categories}
<a href="{path=weblog/index}">{category_name}</a>
{/categories}
Change “filed under” to whatever you want it to say before the list, and change the path to the path of the template you use to display categories (the one in that code is correct for default setups).
Enjoy!