Voters can vote for a single candidate and, if they wish, they can cast their second and third preferences to two more candidates, National Election Commission Chairman Mahinda Deshapriya said, explaining the voting procedure for the November 16 presidential poll.“We advice people to cast their vote by marking number 1 in the box in front of the candidate of their choice and then mark 2 and 3 in the boxes of two other candidates, if they prefer multiple candidates,” he said.