how to config seo yoast

Hi,
i downloaded seo by yoast and getting some problem
1. the main title bar showing site name two times

https://img513.imageshack.us/img513/3227/89714140.png

2. there is no gap between site name and post name

https://img39.imageshack.us/img39/6232/34689065.png

please help me to correct this problems
my website link
https://www.cybervila.com