I'm new to git and using Brackets (Mac) as my main editor. There is a nice brackets git extension. I installed the extension successfully. But – how – can I return / revert / go back / to a commit in history? There is no Button for sth. like this at all. A friend of mine, using git for years on ubuntu, failed as well. 
As I am new to git I do not even know what the right terminology is for what I want to do. So maybe its all about my low understanding of git itself. (The setup is not complicated: I work alone, on local machine). 

Would be very thankful for replies.