Hi everyone!

I got stuck with this one... If I begin with "Can you please enlighten me...", what's the preposition that follows? I suppose that it depends on what you are asking. If I wanted to ask about the registration process on a website, for example, should it be:
Can you please enlighten me
on how....? (and what's the word order after the preposition? Is it supposed to be followed by an affirmative sentence word order or...?)
Thank you very much!