New - how do I change font size. Says to go to "ME" and then "SETTINGS" but I do not fine "SETTNGS" anywhere on that page.

When the market opens, whether up or down, there is usually a very large split between the bid/ask.  It usually takes a while to close the gap.
How do you take advantage of these opening swings?  If you enter an options contract or buy the stock and the stock goes up big it will usually correct and come down  With the very lager differences between the bid/ask how does one not take a big loss on an option they should have been able to make a profit on?