This article explains that you cannot delete a pick set once it has been created, but that you can leave a group prior to December 31, 2012.

In the Yahoo! Sports College Bowl Pick'em game, you cannot remove yourself from the game entirely once you have created a pick set.

However, you can remove yourself from a group prior to December 31, 2012. On this date, you will not be able to leave your current group nor join a new one.

To remove yourself from a group:

1. Log into the College Bowl Pick'em homepage.
2. Select the group that you want to be removed from.
3. Select Leave Group to remove your bracket from that group.