When I click on a post it opens up and it is displaying the featured image at the top of the post. The featured image is being displayed as a width of 1024 x 768. This is taking up the whole screen and I want to make this image a lot smaller.
The content is being display by the
the_content() function which I've read calls
the_post_thumbnail but how can I set this so that Wordpress displays the Medium image instead of the full size image everytime?