If you have submitted an assignment and you don't see a grade, that means the instructor has probably not graded the assignment yet. The yellow exclamation point icon means that the assignment still needs grading. If you don't see a grade, it might also mean that you didn't submit the assignment or the due date as passed. Please discuss these matters with your instructor directly.
Instructors are responsible for posting grades. Please contact your instructor with any questions about your grades.