The FAQ database need not be activated in any way, but you must be a member of the 'faq' group to be able to work on it. Do so before proceeding, or you won't be able to see anything of the following.
To have full control over the FAQ section, ie. to be able to post new FAQ entries, give yourself 'rw' rights, resp. to some designated agents. One needs at least 'ro' rights to be able to read the FAQs. Your customers need the 'ro' right, too.