Make your WordPress site blazingly fast and rank higher on search engines with WP Smush Pro. Get the best in image optimization
1 Go to WordPress DashBoard and Click on Plugins–> Add New Plugin
2 Search and install WP Smush
3 Again Click on Plugins but this time Click on Editor.
4 Select WP Smush from dropdown menu and click on select.
5 Click on File namely wp-smushit/lib/class-wp-smush.php
6 Search for if ( empty( $api_key ) )
7 you will see below a line written return false;