i cant still solved :S please help
I think images will change based on the styled size you’ve got for the main content area: Appearance > Theme Options > Styling
Was that what you meant? If not..
Did you mean you want to change the size of the thumbnails because they get blurry now then go to Settings > Media and change the thumbnail size to 300 x 300px. Then use https://wordpress.org/plugins/regenerate-thumbnails/ to regenerate all the thumbnails.
Go To Appearance > Theme Editor > Function.php
Look For the Code below
// Thumbnail sizes
add_image_size( 'thumb-small', 160, 160, true );
add_image_size( 'thumb-medium', 520, 245, true );
add_image_size( 'thumb-large', 720, 340, true );
Change The True To False Then Kindly Please Regenerate Thumbnails using the regenerate plugin that was a required installation with the theme. After Regeneration Also Make Sure to Clear Cache of browser.
Greetings From Speedfreakhorror.com