Enabling the Import Feature in CustomPress

Hi there,
Hope you can help. I'm a novice so please go easy. :slight_smile:
Using the instructions at the bottom of the Export/Import section of CustomPress - I'm attempting to enable the import feature, in order to import a custom post type, created using ACF.

However, I'm unsure where to paste the code; define('CT_ALLOW_IMPORT', true); in the wp-config.php file

Many thanks!