def add_registration(self, username, first_name, last_name, email, password="<STR_LIT>"):
register_user = self.appbuilder.sm.add_register_user(<EOL>username, first_name, last_name, email, password<EOL>)<EOL>if register_user:<EOL><INDENT>if self.send_email(register_user):<EOL><INDENT>flash(as_unicode(self.message), "<STR_LIT:info>")<EOL>return register_user<EOL><DEDENT>else:<EOL><INDENT>flash(as_unicode(self.error_message), "<STR_LIT>")<EOL>self.appbuilder.sm.del_register_user(register_user)<EOL>return None<EOL><DEDENT><DEDENT>
Add a registration request for the user.

:rtype : RegisterUser