Look on the bottom of your index.php template for where it calls for the sidebars.
You will want to duplicate that on your single.php file. Your current single.php file probably only calls for ONE of them. You just need to add the call for the missing two.
Here’s how you can have a different sidebar show up on your inside pages or single posts. Quick instructions:
http://blogcraving.com/sidebars-pages-wordpress-blog/
Thanks.
I have got it working the same as the homepage, but I might want it different in the future. Good stuff to know. Beside the code at the bottom I had to change some stuff at the top as well, including changing column width to narrow.