Hello @sarahnurhanifa,
Thank you for using our solution. Please note that Bitnami packages and configures already existing applications. However, we can only offer support and help on basic and most frequent application configurations. Always based on the default configuration or on our guides.
If the question is related to the application itself or a plugin, probably someone with more experience and knowledge about that specific tool can help you better than we can. We suggest you to post your question on the official support forums of WordPress so others can help you.
https://wordpress.org/support/plugin/wp-fastest-cache/
Do not hesitate to write us back if you have any other questions regarding the Bitnami solutions or their configuration.
Regards,
Francisco de Paz