How do you add a breakpoint in Xcode?

Command + \ to add breakpoint at current line

You don't need to right click or any such thing. To enable the breakpoints in your code all you have to do is click on a particular line number. You'll get a breakpoint symbol in your code there.

You can add multiple breakpoints to your code. The breakpoints button on top is used to put all your breakpoints ON (during debugging) or OFF (when necessary)

I'll be addressing a section on breakpoints in my blog ( http://techtalktone.wordpress.com ) soon.

Hope this helps :D