I have created custom module configuration in admin panel for Enable in fronted and Heading title. But the settings is not visible in the admin Store > Settings > Configuration.

I am following the below tutorial steps:

http://www.mage-world.com/blog/how-to-create-the-configuration-via-backend-for-a-custom-module.html

I have run the command setup:upgrade and cache:flush already and also it's not showing any error. I am using Magento ver. 2.1.3.

Please see the attached screenshot.