No, you may only answer questions if you are registered.  You will have to register prior to starting answering questions. You will need a unique email address and a unique username.

However, if you wish to be featured as an expert with an enhanced profile you will have to ask for your profile to be verified after you have been registered. As features content from contributors who are experts in their field and have established authority, we will thoroughly review each registration application before a verified status is awarded.