Unfortunately, your browser doesn't seem to support WebGL.
You can try doing the following:
Points - Add points using any of the 3 coordinate systems under the Add Point menu. It will ask you a name and parameters for the point. This will create a point on the grid, tracing lines, and label containing the name of the point.
Vector - Add a vector between 2 points using the Set Vector menu item. It will ask you the names of the 2 points where you want to set a vector. This will create an arrow from the source point to the destination point.
Additional info - Additional data about the operations are found in the browser's console. Hit
CTRL+SHIFT+I and find Console to view the additional data.