I would also be interested in re-writing text (Unless, of course, Whiteknight gets the position) I am a native English speaker, and used to do something similar for Japanese speakers in a language exchange (I help fix their English, they fix my Japanese).

I suppose for an example of my work you could see the amazon gift codes I'm selling in my signature.

NOTE: Some of these are probably not exactly worth a bounty, but still a good idea to change, I may post more after my account is verified.

Something I notice quite a bit recently, is the lack of liquid layouts, my screen isn't that small, but I get some cut off for some reason:

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to
charge from you -> charge you
You use a lot of periods, when the sentence would be more fluid with commas.

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to
openend -> opened
very small initial loss -> very small loss | Redundant

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You may not want to use "Administrative stuff", stuff is informal (although, some sites are going for a very informal approach in their documentation)

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https://1broker.com/?c=faq
to
No dash in market-prices

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In the account sign up:
to
More professional (includes time frame, more formal language)

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When unverified:
to