You can allow users the ability to ask a question while doing one of three options: not logging in or entering an email, not logging in but entering an email, or logging in and entering an email. You have the ability to change these options by going to "System Settings" then "General Settings" in your Admin area. Click the image below for a screenshot of where to achieve this.
If you have any other questions just let us know, that's what we're here for. You can ask a new question by using the following link: http://help.answerbase.com/Question/Ask