"How it works" without the question mark is fine, too. The site actually uses "How it works ?" which is a dead giveaway that the author is French.
As an ESL speaker myself, I wouldn't nitpick about grammar, though. The language on the site is very good in general, and learning second languages is very difficult. Je sais je ne peux ecriver francais bien. Right?
As an ESL speaker myself, I wouldn't nitpick about grammar, though. The language on the site is very good in general, and learning second languages is very difficult. Je sais je ne peux ecriver francais bien. Right?