If they haven't already addressed your question in one of their published articles, you can fill out the form on the “Submit your Bible Questions” page (http://www.gotquestions.org/Bible-Questions.html), and they'll do some research and answer it for you.
If you're looking for a discussion forum, here's the link for a list of the ones that GotQuestions.org recommends: http://www.gotquestions.org/forums.html.
Note: Over the years, Gotquestions.org has received many letters from people around the world who appreciate their ministry and whose lives have been changed by it. I love to read those letters (which are on the website's "Testimonials" page), but they can be hard to find. If you want read those letters, too, here's a direct link to that page: https://www.gotquestions.org/testimonials.html.