Should you need to update the ETA for a consignment, you could do so upon navigating via the unmanifested page and active consignment page.
How to navigate to the Consignment Page
To get to the Edit Consignments screen, from the top menu Create/Manage, click Unmanifested or Active Consignments under the Consignments section.
Select the Consignment and via the drop-down cog on the right-hand side select View Consignment.