Hello Michelle,
The system info page available at “Bulk WP -> System Info” menu only displays the configuration information of your WordPress installation. To actually change the values of any of those configuration you may have to edit your configuration files. Depending on the configuration it would either be wp-config.php file or the php.ini file.
To increase the amount of memory available to WordPress you have to add the following lines to your wp-config.php file.
define( 'WP_MEMORY_LIMIT', '256M' );
You can read more about from WordPress documentation.
Also, your FAQs list of variables to change doesn’t exactly match any of the variables in the system info file… though there are several that I think they map to. Can you just please confirm the correct variable names to change to?
The values that are displayed in the FAQ are the ones that needs to be modified in php.ini file. In your case you should be able to increase the amount of memory in WordPress by just modifying the wp-config.php file.
Let me know if you still face any issues.