[Plugin: WordPress SEO by Yoast] Title Got Messed

Hello can someone provide me the correct step by step settings on my blog? actually it always messed up even i tried all the solutions posted in this section.

i want it to show like this

Post Title – Homepage Title

my site post only showing title like this one

Post Title

🙁

Here’s the Site Im Talking About : http://x-cheats-x.com

http://ww.wp.xz.cn/extend/plugins/wordpress-seo/