I gave student attempts feedback in ScoreCenter. How do students see feedback I gave to their attempt?

You can give students feedback on their attempt in ScoreCenter using the Actions menu.
See FAQ https://softchalk.atlassian.net/wiki/spaces/SCFAQ/pages/2497839117/ScoreCenter+details+at+a+Glance#Individual-Learner-Attempt-Details

To view the feedback, students will launch the SoftChalk assignment in the course again. Once the lesson has launched in the browser, the below popup window will display over the lesson page. Students will click Feedback and Previous Attempts to access the instructor’s feedback.

From this link students will be able to view the feedback provided in the ScoreCenter Actions Give Feedback menu option. Students will also see the date, status, and score earned for their previous attempt.

If you have provided feedback when scoring an Essay response, students will click on the essay drop-down icon to display the Essay question, score and feedback entered.