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FTP into your site, navigating to wp-content/themes/platformpro and look for templates.postloop.php. Edit the file.
Once open, search for:
<?php the_post_thumbnail(array(
Right after that are two sets of numbers. Change those but I don't suggest having them uneven as it could seriously change the way your thumbnail looks. I'm unsure if it will crop, stretch or squeeze the image. Save your changes and restore the file. I'd also suggest downloading a revised copy somewhere in case it's overwritten by a future update.
PageLines Moderator, Renaissance Man, Food Expert and Raconteur
What rangelone meant by uploading the file back again is by opening the file in an HTML editor via FTP and saving it rather than viewing it in Appearance > Editor and updating it. If you're not familiar with FTP and how to use it, please see here: http://codex.wordpress.org/FTP_Clients
Ok -- figured out the FTP and downloaded Filezilla. I'm now changing the two numbers in my text editor and still, no changes to the size of the thumbnail images.
I know that I am uploading back to the server because the numbers do change under appearance > editor.
It's looking like this right now:
<?php the_post_thumbnail(array(400, 400));?>
I was jumping up to 400px to make sure the photo size was changing.