If the student is already logged in and using Write & Improve when you add or change some feedback, they will have to refresh their page or log out and in again to be able to see it.
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Next time your student logs in to their account, they will have a badge in their sidebar next to the  'My writing' link under 'Progress'. The number tells them how many pieces of feedback they have that they have not yet seen.
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When they click to see their writing, they will see a label against the answer for which feedback has been added.

When they click to see the answer, they will see the feedback and grade underneath the annotated text.