When you click green underlined text in the help system, another panel of information is displayed. The little panel you are reading right now is a pop-up window because it does not cover the entire help system display area on your screen. Click your mouse button anywhere to close this pop-up window.
Sometimes, when you click green underlined text, a full page of information is displayed. To return to the page you were reading before the full page was displayed. go to the Back button at the top of the help window and click it. After clicking BACK, you will be navigated back to the original panel you were reading.