Patti, the left or right in the shadow tags refer to which side of the text you want shadowed.
[shadow=red,left]TEXT[/shadow]
shadows to the left, or
TEXT
and
[shadow=red,right]TEXT[/shadow]
shadows to the right, or
TEXT
and if you want the shadow to be neither left nor right you use
[shadow=color, glow width, #characters wide]TEXT[/shadow]
or
[shadow=red, 2, 4]TEXT[/shadow]
to get
[shadow=red, 2, 4]TEXT[/shadow]