Sometimes its a bit confusing to change title of a wordpress site. The easiest ways to do so are as follows
1. dashboard -> settings ->
you will arrive on the General Settings page. The top slot is for Blog Title – type one in. The next is for a Tagline – type one in or remove what’s there scroll to the very bottom and click “save changes”
2. All in One SEO setting
Sometimes it is under the All in One SEO package setting. Set/ change the Home page Title there.