How do I install the launcher bookmarklet into my browser?

Go to the My Testing Center tab. The bookmarklet is in the 'Bookmarklet' area and says 'CBT Launcher'. You can either drag it into your favorites list or right click on it (on Mac: control-click). Here is an article that discusses the techniques in the various browsers - http://www.oreillynet.com/onlamp/blog/2005/09/writing_instructions_for_insta.html.