This plugin enables 2-step verification using one-time password when you log in your WordPress.
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The control panel of Spirits and Goblins is in 'Settings > Spirits and Goblins'.
When you use Short Message of Send option, you have to sign up Twilio and get Twilio sid, Twilio token, and Twilio phone number. Also you need to put in your country and your cell phone number at the user profile.