First thing to point out is that eastings are equivalent to X, and northings are equivalent to Y. So make doubly sure that you get things round the right wayNow, I understand the whole concept of coordinate points, X and Y points etc etc etc.
Then when you enter coordinates, there are two ways of entering the data. One is absolute coordinates and the other is relative coordinates. So make sure you have got the correct one, then you should be good to go. Enter the coordinates x,y on the command line. You can always ID a point/end of line to make sure it is the correct coordinate.