I have just downloaded ArcGIS Explorer Desktop - it is the newest version 3400. I looked for tutorials, which are probably for older versions, but they show 2 ways to access ArcGIS Online. One is through the ArcGIS Explorer Button menu and the second is through the Add Content button. But I don't see ArcGIS Online maps through either of these ways of accessing (see screencaptures attached). I have signed into ArcGIS Online.