Step 1- From the module page, click on the assignment you want to grade.
Step 2- Click on View all submissions
Step 3- Select the student you want to grade by clicking on the Grade button adjacent to their details.
Step 4- Annotate parts of the assignment using the tool bar located at the top of the page and leave a grade and comment on the right side of the page.
Step 5- Click on Save Changes or Save ands how next to grade the next student in the list.