It looks like your site is defaulting to using a 150x150 image size. You should be able to select a different sized image when you are setting the featured image in the post editor. You can also change the default image sizes under "Settings -> Media" in WP admin.
thanks for your thoughts, i have attached a screen shot of Settings>Media as I have looked there as well. I don't see any editable solutions within the Post itself. I you have any further thoughts. I would really appreciate it. See attached.