Hello,
could you please explain more in detail what you would like to do?
From the response you are getting it seems like you are using Google Assistant Integration, and the response message is reminding you that in that case you should use the Google Assistant Simulator to visualize the output of your commands.
I am attaching some useful guides about Dialogflow’s Google Assistant Integration that can help you to understand it better.
[1]: https://developers.google.com/assistant/df-asdk/overview
[2]: https://developers.google.com/assistant/df-asdk/dialogflow
[3]: https://developers.google.com/assistant/df-asdk/actions-sdk