How to add different titles on different web pages

Hi,

Can someone help me how to add different page titles on different pages.My website is https://vletuknow.com which is coupons and deals site. My requirement is each page should have different title and descritption. As of now title of the home page is appearing on all my pages. I want to add different titles on different pages. For example if I am on ebay store, I want my title should be displyed as ‘ <title>EbayCoupons: November 2014 Coupon Codes</title>’. Instead my site is showing the main page title every where like ‘<title>vletuknow – Best offers, coupons, promo codes and deals in India</title>’. Currently I am using yoast SEO plugin.

Can some one help me on this?

Thanks