Botsify works best when you log in with Facebook, its because it reduces several steps you will have to perform in order to configure your Facebook chatbot. But if you choose to sign up with Facebook, the process will be very easy for you.
Despite having signed up with Facebook, it depends if you have a Facebook page or not. Because a chatbot works only with the Facebook page. You will have to create a Facebook page if you don't already have one.
The manual configuration is very difficult for non-technical users. But if you want to connect your chatbot with your own application for better scalability, you can configure your chatbot with your Facebook application. Here is how.
When you create a chatbot with Botsify, you are asked to connect it with your Facebook page. You can see at the left toolbar select publish bot, then "Connect to Facebook"