Is currently installed xwindow, use startx opens, according to the following interface

But in this case, I can't use the mouse to operate, I see is possible in the demo video of the mouse operation, can you tell me how to implement?
Xwindow operate I didn't find a lot of information on the net, if just using the keyboard, please need regular operation have?

In addition I install xwindow installation is the purpose of the browser, and use the browser installed flink, excuse me next I installed can download properly use flink browser?