Log in to the HTML5 client.
Select the Deliverables Center workspace.
In the Deliverables Grid, click on the Open button available on the right-hand side of the Deliverable Name to open the Deliverable Card.
In the Deliverable Card, click on the Add Assignee label.
Select an Assignee in the list.
Click on the CLOSE button to close the Deliverable Card.
The Assignee is automatically updated in the Deliverables Grid.