How do you create KO Tournaments?

I have created many league type tournaments but cannot see an option for KO tourneys.

(Also it would be nice to be able to create Swiss tournaments).

For KO tourneys, don't you simply set it up so that the groups in each round are groups of 2?

All tournaments on the site are knockouts.  http://www.chess.com/tournaments/help.html#knockout

Knockouts work best with large groups and tiebreaks. The suggestion offered of a two-player match is close to your needs except there is no tiebreak in a two-player match. Many times there will not be a knockout and both players will advance to the next round.

With 64 players, 6 rounds could stretch to 10.  http://www.chess.com/tournament/almost-single

With 32 players, 5 rounds could stretch to 8.  http://www.chess.com/tournament/1st-place-race-fpg-kos

With 4 players, 2 rounds could stretch to 5.  http://www.chess.com/tournament/awardchess33-match2