GMAC, the makers of the OG / owners of the copyright, enforce that copyright online, so they don't permit content to be posted publicly. The forums were locked at the point that they made this request, many years ago.
If the Navigator solution isn't sufficient and you are taking a course or working with one of our tutors, you can ask your teacher any questions you have. (If you are an Interact student / don't have access to a teacher, you can send an email to
gmat@manhattanprep.com and our student services team will get an answer for you from one of our instructors. Note that there is limited use of this mechanism—Interact does not include live instruction, so someone who wanted ongoing support from an instructor would need to do some tutoring. I don't know what the exact parameters are, but you can probably ask about 2-3 problems that way before the student services team would steer you to tutoring.)
If you are not taking one of our programs, the forums here are normally where you'd go—but the OG copyright restriction means that we also cannot answer those questions online, unfortunately. In this case, I would recommend looking at another website such as GMAT Club. (Many forums do still host OG questions, despite the copyright restriction. Our organization sticks to the rules because we work closely with GMAC on various other fronts as well.)
Good luck with your studies!