You go to the general clans page from the clan castle, then
press search clans
View page
In real life the Taira and the Minamoto clans were the two
strongest clans of the 4. The other two were the Tachibana clans
and the Fujiwara clans.
View page
right click your wc3 icon and click open file location then in
that folder that opens find world editor and open it, world editor
doesnt have anything to do with clans