It appears that you’re using OJS 2. You will need to record a decision for Round 1 first.
If you would like the author to make revisions prior to Round 2 you will record revision required email the author with your decision and wait for the manuscript to be re-uploaded. Once the manuscript has been received, you can then change the decision to Resubmit for review. This will prompt you to select a version of the manuscript for Round 2 reviews.
If you would like to resubmit for Round 2 review without revisions you will select and record this option in the decision box. The system should then prompt you to select a document for Round 2 reviews.
Public Knowledge Project Team