changing the points in a question

[PhaikLim]

i made a mistake and gave the wrong points for a question in a quiz.  I went back to the quiz and edited it to give it the correct point after the students have taken the quiz.

How do i change the grades of the students?  I have 900 students.  Canvas help tells me i have to change it manually.  

[RecycledElectro]

I would go into Speed Grader and manually adjust every quiz grade.