Go to Facebook Developers section and login to your Facebook account, if you are not logged in already. This should not be your business account.
If you are here (at Facebook Developer section) first time, you will require to “Register as a Developer” (If you have already done this, skip this step and move to step 3). Click “Register” button.
And Facebook may ask for some personal information
Next, you will be shown a message
After clicking Done, you will be redirected to the Apps page.
Click My Apps and then click “Add New App” link
Enter the name of your app in Display Name option ( it’s recommended to enter your website or company name in this field), enter your Contact Email and click Create App ID button
Then click skip because we don’t need any special integration.
Finally, the app created and you will be redirected to app home page.
Just copy the Facebook App and Secret from Settings > Basic section in the left sidebar and paste in the Facebook App ID and Facebook App Secret in advance tab settings.