Question:

How can I set a post thumbnail image without making a featured image?

Claire: 5 days ago

When I set a featured image, it is allways on the upper left corner of the post. Sometimes, like in this example post (http://martin-thoma.com/compare-planet-sizes/), I only have very few text and one image. But this image should not be on the upper left corner of the post.

Is there any way how I can this little post thumbnail image in the tag-overview (http://martin-thoma.com/tag/learning/) / category-overview without having it in my post? Could I tell wordpress that the image in the middle of the post is the featured image?

Answer:
Ezra: 5 days ago

This is your theme specific to show featured image in single post view.

I think you're using Modern Style (http://flexithemes.com/themes/modern-style/) theme, just remove following code from single.php on line 14, now featured images only will be shown on tag/category archive pages (and I think on main page too ).

<?php if ( function_exists("has_post_thumbnail") && has_post_thumbnail() ) { the_post_thumbnail(array(300,225), array("class" => "alignleft post_thumbnail")); } ?>