In my Wordpress blog, I want to change the Facebook comment iframe position in my single posts.
It is currently at the end of the post but I want to move it to under the line to the "No Comments yet." part.
You have added the code in the wrong position.
You need to remove the code from inside <div class="entry"> place and move it the bottom inside of <div id="comments">.
If you provide us with the simplified code you are using, we can show you where it needs to be placed.
Update: Since you are using wordpress, then you may have to contact the developer to ask them to change it. If you are using placeable code, then please show us.