No, TTT is the Esperanto abbreviation that's the equivalent of WWW. The word for website is retejo (reto = net or web, -ejo = ending indicating a place), which needs to be made into an adjective, so reteja. It then needs to be made plural to match the noun it describes, so retejaj. You can use agordoj for settings, or preferoj for preferences. So, retejaj agordoj or retejaj preferoj would be OK.

Fortunately, we don't need to worry about the accusative hereā€¦ ;-)