The Blur > Radial Blur effect
This blur is applied in a circular manner around a point the position of which you have chosen on the screen. The second parameter to be set is the power of the blur.
Before applying the blur :
After applying the blur :
The Blur > Directional Blur effect
This blur is applied only in the direction (angle) of your choice and the spread of your choice. You may set the vector parameter directly on the screen.