I am trying to create an action button, but unable to see that. When testing the bot, by clicking start, it is initiating a message I didn't created. Please help.

In the Actions section, click the Create Action button.
Give the action a name and select an action type, such as Send Message.
Configure the options for the action, such as message text.
Save the action.
To test your bot, you must use "Bot Testing" on the bot settings page. Enter your message text and click the "Submit" button. If your action button is properly configured, it should initiate the appropriate action.
If you still get an unwanted message when testing, make sure that you have configured all the settings correctly.