BB parameters in MT

 
When I use the open the Bollinger Band Indicator, it comes a dialog box of setting parameters including Period, Deviation, apply to, color, and shift. Shall I write StdDev number into the Shif Box, or something else?
 
shift box used only for shift value. sorry for such explanation. You can shift some indicators back or forward on the chart. if You don't know for what used shift then leave zero
 
Thanks!