I use EFX, and they have a lot of order options and combinations (trailing stops and so on), but I only really use market, limits and stops.
It's simply a case of choosing the order you want, setting the number of lots (unless you have a preset amount which you can change in the FX Board preferences), then hitting the buy/sell button. The order then goes into the orderbook. Assuming you've entered a limit or stop, you can change the level and amount of an existing order by right-clicking it in the orderbook, selecting "change order", then making the changes you want.
I haven't had many problems with EFX and on the odd occasions I've had to phone them, they've been helpful. They have a PDF that outlines all the order combinations, available on their website, if you need clarification.
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