In what forum are you trying to post?
You should see a green box that says "post a question".
1. In some expert forums, there is no doctor available so they are closed forums. In that case, there is no button. (Example: At time of writing this note, the Dermatology ask a doctor forum.
Just because a forum is closed does not mean Medhelp can't help you. Most of the time, there is a community support forum. Although these people are not doctors, they can help you understand symptoms, what to expect, and what worked for them.
2. For some specialized forums (called user groups), you have to join to be able to ask a question. So if you see a "join" button but no post button, you can try that.
Thats the same thing im trying to figure out