You can grade your graded discussion using SpeedGrader.
creating the Discussion) in SpeedGrader, first open Discussions from the link on the Course Navigation Menu [1]. Click the name of the Discussion you want to open [2].
To grade a graded Discussion (you must have checked the Graded box whenClick on the More Options icon [3] and then click SpeedGrader from the drop-down [4].
View the submission [5]. Enter the score in the Point Value field [6] then click Submit [7]. To view the next student's submission, click the right arrow [8] or to go back to the previous submission, click the left arrow.