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The timeline is where you set the order and depth of the banner's elements and change the length of each element as well as applying animations(transitions and pulsate effects). It's rather similar to any video or photo editing software.
Moving elements is done by clicking and dragging each element-layer in the timeline.
The topmost layer is the element that will be displayed above all other elements in the banner, the one layer on the bottom will be displayed below all other elements.