You can select the one point and move it or you can select the 2 points and right click->Subdivide to add a point between the 2 points and then move that one. You could also use the subdivide-dissolve method if you don’t think you can move it into position on your own. So you select the 2 point, right click->Subdivide. Either press F9 or open the adjust operation panel in the left hand corner. Change the number of cuts to something like 5 or 10. Then press ctrl+numpad minus or use select menu->Select less so that the 2 original points are no longer selected, but all the new point are still selected. Then subdivide them as many times as you need to get a point at the location you want. Then Shift+select on that point so that it is no longer selected. The only thing that should still be selected is all the extra point you don’t need. now press ctrl+X->Dissolve or X->Dissolve to get rid of the extra points not needed.
***Edit*** The number of subdivisions you need in the first part is determined by when you have a new point on each side of the line that you’re trying to get a point on. This way you can unselect the original point so you don’t dessolve them by accident.
