Insert text box in subplot

I have 4 subplots. I wish to insert a text box in my fourth subplot. I can't understand how to position the text box. Kindly help.

[KSSV]

You can insert via figure window, through GUI....

Answer 1

[Sid Jhaveri]

I understand that you would like to insert a textbox in of your subplots. The following links might be helpful:

1) https://www.mathworks.com/matlabcentral/newsreader/view_thread/154660

2) https://stackoverflow.com/questions/14262354/textbox-in-matlab-plot