The United Klans of America has agreed to stop wearing hooded robes and burning crosses in front of blacks in partial settlement of a $10-million suit, an NAACP official said. Robert Gilliard, president of the Mobile, Ala., chapter of the NAACP, released a letter from lawyer Morris Dees detailing the agreement with United Klans President Robert Shelton. Dees, head of the Montgomery-based Southern Poverty Law Center, filed the case on behalf of the NAACP and the family of Michael Donald, a black teen-ager killed in Mobile by klansmen six years ago. Two men were convicted in that case. Despite the settlement, the suit continued with the selection of an all-white jury that will decide if Donald's family is entitled to damages from the klan.