When you click those buttons from the STEDI.org web site, it should open a new window and load STEDI Course in that new window. If this doesn't happen it is usually caused by one of the following:

Your browser pop-up blocker is blocking the new window.
A pop-up blocker may be blocking that new window from opening. Please check to make sure your browser allows pop-ups from STEDI.org. 

Your browser is opening the new window behind your current window.
Sometimes browsers will open the new window behind the current window. Thus, you won't see the new window open and load STEDI Course. Please check to make sure this is not happening.