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To view the report that was created automatically upon the submission of the assessment you need to go to the assessment summary page. You will find more on reports in here.
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If you have finished assessing and adding flags/comments to the assessment, you need to send back the assessment to the completer to rectify their answers. In order to send back the assessment to the Completer, you need to click on the ‘Send back’ button on the right side of the assessment summary page. Once you send assessment back to the completer, you can still view the assessment but it will be inactive for you until the completer will submit it again.
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When you have finished the assessing process and are satisfied with the answers, you have option to Approve/Reject the assessment.