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This seems to result in a limit order (after clicking the T) of 100 shares, and both the price and size can be changed by clicking on it
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Before hitting "T" you can click on "LMT" and change it to other types of orders. (Such as market)
You can also have several orders ready to transmit, (one limit, one market, etc.) and transmit the appropriate one when the time is right.
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Do you consider it "safe" to enter and/or modify orders in this way or should I be more careful
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That's the way to do it. After a couple of days you learn to look at only the right things, and see through the many options only the ones relevant to you.
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Do I treat stocks and futures orders the same way
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Mechanically, yes. The tickers for futures are NQ or ES, then select the contract (March), and GLOBEX (I had to ask the first time...)
Futures move and feel way different from stocks so be VERY careful. Start with one contract. I assume you've been following the excellent comments by Train Guy and a few others about this subject. I also heard that Lee is VERY good so you should be in good hands.
H.
