Find the "Item FAQ" tab on the individual product page. There will be a button to submit your FAQ. It may already say "Successfully Submitted." That's a bug we're working on. But, have no fear, add your text, press the button, and your FAQ will be submitted to us.
To avoid spammy FAQs, we approve each one. We'll look at your question, do our best to answer it. And we THANK YOU in advance for using the FAQ so that others may benefit from the answer to your question.