Can't make angle free lines( only horizantal and vertical )

Hi Dear Rhino Community:

I am having trouble on making angle free lines. I can only make lines which is vertical or horizontal.

In the picture above, the red dot is where I am aiming. I have re-installed Rhino to make angle free lines, but problem still remains.

Thank you all for your time.

Turn off Ortho, or suspend Ortho by holding the Shift key.

Consider running through a few Getting Started tutorials on the Learn page.

Thanks a lot for the help John !!!