Here you may plan Iterations by dragging User Stories and Bugs between areas.
Planning process consists of two activities:

1. First, assign items on Iterations
2. Second, assign items on team members

For example, to assign User Story to Iteration , the following steps required:

1. Select Backlog in Select Iteration drop down in left area
2. Select first Iteration in top right area
3. Drag User Story (Name of User Story is draggable), target areas will be highlighted
4. Drop User Story on top right area, thus assigning it to first Iteration