Open DarkcoinPool with autochange your earned coins on Litecoin! Reward type - PPLNS, 1% - pool fee. For connect to pool - stratum+tcp://switchercoin.com:2222.
More details about mining and settings for popular video cards Getting Started page.

Also, always use option "kernel":"darkcoin" in config file Sgminer. Without this setting all your shares will be rejected.