Changing title on all other posts but should remain same on homepage

Hi,how can I change website title on all other posts but should remain same on homepage.
For example my website title is

Opinion Time – Product Review to Help You Choose Better

now one page catogery page is “Contact”

this page’s title should be shown like “Contact – OpinionTime”

But shows like that “Contact – Opinion Time – Product Review to Help You Choose Better”

How do I fix this

• This topic was modified 2 years, 3 months ago by Jan Dembowski. Reason: Moved to Fixing WordPress, this is not an Everything else WordPress topic

The page I need help with: [log in to see the link]