Use the Timeline at the bottom to choose the date of observation. You can change the date by typing in the date fields, clicking on the up and down arrows by each field, click on the back and forward arrows and change the temporal zoom level. You can also use the slider on the right to change the date. You can animate the imagery by clicking on the video camera icon. Click on Play in the animation box to watch the imagery change day by day. You can even export it as an animated GIF.