With drop-down lists, users can choose from the list of choices presented but cannot write in an entry of their own. Please add the ability for a user to add a new entry to the list. For example, if a drop-down list in the field "Member Type" already has "Professor, Postdoc Fellow, Graduate Student, Senior Researcher, Lecturer" and the user doesn't see an appropriate choice, he/she can do an ad-hoc entry, say "Independent Researcher".