Increasing PHP Memory Limit

• Using a cPanel access credentials or an FTP account, open your WordPress installation root directory -> edit ‘wp-config.php’ file.
• Add this line to the file in order to increase `Time Limit` to `300`:

set_time_limit(300);

• Add this to the top, before the line that says, “Happy Blogging”:

define('WP_MEMORY_LIMIT','300M');

• Save changes to your file, check again your PHP configuration to make sure that PHP configuration has been updated, try again to run the editor page.

If you are not feeling comfortable in trying the above methods, or the above did not work for you, you need to talk to your hosting about having them increase your memory limit.