In order to rearrange slides please tap on the Slide Sorter. Then, press and hold the thumbnail of the slide you want to move to a different position and drag the slide to the desired position.
Deleting and duplicating slides
If you want to delete or duplicate a slide please tap on the Slide Sorter. Then, press and hold the thumbnail of the slide you want to delete or duplicate or tap Edit and select the slides. Tap the Bin icon in the top left corner to delete those slides or the 2X button to duplicate them.
Custom slide background (template or picture)
In order to change the background of an existing slide please tap on the Slide Sorter. If you want to change the background for all the slides at once, tap on the Palette icon on the top-left hand side and select the desired new background template. If you want to change the template for only particular slides, tap Edit (or press and hold a thumbnail of a slide), then select the slides for which you want to change the template.
You can also use any photo (from your Photo Gallery, 3rd party service, or a new photo), and set it as the background image. First, insert a picture using Insert Object and then select the Inspector. Tap on the desired image and choose Set as background from the Edit tab.