I'm not sure what you're asking exactly. If it's how you create a new world using a specific seed:
Under the "Start Game" menu, select "Create New World" then select "Seed for the World Generator" input the seed string you want (in this case type in the negative number -5279432944268859068 ). This will produce the landscape related to the current update and that seed string. You can then walk to the coordinates I gave to see the very interesting extreme hills that this seed has. You can also use this technique to create any of the other seeds described here that are for the current TU. Seeds that were described here before the current update may now generate differently than described due to changes to the terrain generation code made by the updates over time.