Project Administrators will need to change the status of submissions from Draft or Abstract to Review if they want to assign them to reviewers for reviewing.
Start off by going to your Submitting dashboard
Click on the Draft Submissions or Abstract Submissions tile to see a list of those submissions:
Select the Submissions that are ready to be reviewed by clicking on the checkboxes on the left hand side:
NOTE: You probably want to only choose Complete submissions but you are allowed to assign incomplete ones too
Click on Edit Selected Submissions at the top
In the dropdown, select Status and then choose the Review status you want the submissions moved to and then click Save
The selected submissions will now be in a Review stage and ready for you to assign.