Using Windows 10 I’ve found that in certain main forums categories, I can’t start a new discussion, while I can do it in the “old” Apple App. But in others you can. To be specific:
In the forums “Medical School and Premed”, “Colleges and Universities”, “Ivy league” which I frequent, I believe there are more. In Windows 10, you CANNOT start a new discussion because the yellow box does not appear, whereas in the apple app, you can by hitting the “pen” icon. Now I am talking about the MAIN category, not the sub categories under the main.
In the forums like “College Search & Selection”, “College Admission” and “What’s my chances” etc., you can freely post “new discussions” and I have frequently do so.