I am trying to remove the plug-in for Unsubscribe to avoid the message appearing every time I open my Mac. To do so, I am supposed to click on the "Go" button in the Finder window. Unfortunately, I can't see where is the "Go" button on the Finder window on an iMac OS X Version 10.7.5.
It is likely directing you to the Go menu in Finder. It looks like this.
Lets you directly to "go", then pick your submenu