Adding or Displaying Site Actions Gear Icon Using Custom SharePoint Master Page

I am using a custom Master Page within my SharePoint Site in SharePoint 2013 Site. In the top right corner the Gear Icon is not displaying. But when I hover on it the place holder work and when I click on it the menu is displaying correctly.

Now I want it to display that gear icon using my custom master page.

So how can I do that? Could someone help me to solve this?

Thanks and regards, Chiranthaka