To ask a question to the whole community, you need to create a post.
While creating a post is very easy, there are some tips on creating an effective post, so that people can help you with your issue or utilize information provided by you properly.
Here is a video to explain those tips.
Once you create a post - you would have automatically subscribed for that thread i.e. you would always be notified about any updates on this topic, through your e-mail.
If you want to change this settings - please check the following thread: