How do I edit or delete a submodule? Thank you!

@Robert.H.5719 This is a great question!
If you're using the New Content Experience, you can follow this short tutorial to edit or delete a module or submodule

NCE Edit and Delete a Unit or Topic - Brightspace Guided Training for Instructors

If you're using the Classic Content Experience, you can use this short tutorial to edit or delete

Classic Content Edit and Delete a Module or Topic - Brightspace Guided Training for Instructors

*(Just make sure you're logged into Community to access the tutorial)

@Hilda.S.5348 I think you're looking for information on adding and assignment and a rubric and grade item to your course.

This article describes how to do that for both the New Content Experience and Classic Content and it includes some helpful video tutorials too!

Create an assignment - Brightspace

Let me know if I've misunderstood what you're looking for though