You will need to set up your Grade Book by following the step-by-step directions found here.
Rubrics are used to evaluate an activity or item based on a predefined set of criteria. They help students know what criteria they will be assessed on and help to ensure they evaluations are fair and consistent. More information about how to create and use rubrics can be found here.
You can provide students with comments and feedback when they upload documents to Box. More information about adding comments to Box documents can be found here.