Proof owners can add a checklist to a proof that is already underway and in proofing.
To add a checklist
Click the cog icon to manage your proof.
Select add checklist.
Select the checklist template (double-check this is the correct checklist), and adjust any checklist settings. Click add checklist.
Note: Once the checklist has been added, it can not be changed to a different checklist, or removed from the proof.