To export the rejection comments

1. Navigate to Reports > HR Admin Reports 

2. Click the Download button under the Confidential Comments Report

3. Select the cycle name from the drop down and click the download button.

4. Now the report will be downloaded to your system

PS: Synergita implementation for your Organization may vary from how the features are described here. The screenshots given here may also be different from what you see in your system. Please talk to the concerned person in the Organization for any specific queries.