How to draw xyz axis in corner (Examiner Viewer in jogl demo)

I’m trying to develop using Examiner Viewer in jogl demo.

I’m having a hardest time drawing the XYZ-axis in the corner of my screen.

I’d like it to stay in the right corner as I rotate and zoom in/out.

Any idea how I should approach this problem?

If possible, Please tell me in detail. (the first time in 3D Program.)

Thanks.