Ask a question by posting it as a discussion. There might be another person who has the answer to your question and can post a reply. You can mark a discussion post specifically as a question when you create the post. (If you don't initially mark the discussion as a question, you'll have 15 minutes to change your mind after you post. Within that time, you'll see a link to change your mind in the discussion post.)
To post a question, click New > Discussion, then choose a location. Under Start a New Discussion, after titling and describing your question, be sure to select the Mark this discussion as a question check box before clicking Post Message.