Log in to the HTML5 client.
Select the Work workspace, Agile tab.
Select a project in the Project Data Selector.
Open the Iteration Details full screen view by clicking on the Iteration Name displayed in the Timeline section.
Select the Overview tab.
Click on the Backlog Item Name available in the Backlog Item card.
In the Backlog Item dialog box, click on the More () button and select the Move to another Iteration command.
Select an Iteration in the list.