route orders to lit market

Anybody know how to route orders to lit market (in settings?) in TD Ameritrade?

 

They do not offer that. We have a list you can choose from. https://www.lightspeed.com/pricing/routing-fees/

 

Assume stock is 9.97 @ 10.03.
So if you place a buy limit 10.00 order through TD Ameritrade where does it sit? Does the bid/offer display change?
If there is another order to sell limit at 10.00 from another firm like TD Ameritrade but not ameritrade itself are those orders ever/never matched.

 

You would have to ask them. My guess is with VIRTU or Citadel.