To place a vector on the screen, place the mouse cursor at the desired starting point of the vector, press the left-side mouse button, and drag with the mouse.

To move a vector, place the cursor over the large dot located at the midsection of the vector, press the left-side mouse button, and drag the vector to the desired location.

To see the resultant vector obtained by adding the two displayed vectors, move one of the vectors such that the head of one vector touches the tail of the other.