Not sure there is an easy way
draw a line from the point to change
Add a point near this point to change on the curve
Kill the point
Move the point to the end line
Kill the line

For add a Corner Point
Add Point with Ctrl on the curve near the line extremity
Kill the curve points
Move the corner point to the line
Kill the line

Hi Nos, there isn't a way to change an existing point, so what you do instead is insert a new corner point next to the current one, and then delete the current one.

Or if you want to make a new non-corner point, delete the existing corner point first, and then insert a new non-corner point after that.

In the future I do plan on adding kind of "point properties" option that would let you switch an existing point to different styles.

- Michael