TradeStation Help
You can use the Bid, Last, and Ask buttons to select a price for a trade.
The buttons display the current Bid, Last, and Ask values for the symbol entered in the Symbol box. The buttons also display a bid tick indicator.
Depending on which Order Type you choose, the Bid, Last, and Ask buttons change the Limit Price and/or the Stop Price for your symbol:
For instructions on how to display the bid, last, and ask buttons, see Displaying or Hiding the Bid, Last, and Ask Buttons.