Change your FB Followers Setting in order to Machine Liker work properly.
Click on "Login with Facebook" button on the homepage and the login page will be opened, fill in your Facebook credentials and generate your access token.
Copy your full generated access token and paste it in the login box and click on "Login". You'll be logged in now.
Change your post privacy to "Public" as shown in the pic below.
After logging in, you will see page which has several options and one will be Auto Liker, click on it. After that you will see page like shown in the below picture, now click Get Likes button and set the options.
You'll see the "Send Likes" dialog box now, set the likes limit and click on "Send Likes" to start getting likes.