This is what I don't understand about the trade being "filled."
I Sell Bitcoin and have a limit of $$. If the price goes up and hits $$ then the Trade is "filled" and lost money.
In my last case, I Sell Bitcoin and it kept going down, down, down, which I want. When I open the order then the only option is Cancel.
After 30 minutes I cancel the order.

Is the only way the trade is "Filled" if it goes up and hits the $$ and then it's filled?