Go to Select All or press CTRL A on your keyboard and copy the frame. You can choose other shapes if you wish. You can download some creative PowerPoint borders already to go and add them into your slides.
Ill click one to apply it to an image.
And you can click on the Insert Shapes option and then you will be provided with a number of options such as rectangles or circular shapes. To add a bordersuch as a solid or dotted linearound a slide you first add a square shape to the slide then change the shapes attributes so it behaves like a border. For example you change the size of the shape give it no fill as opposed to a color fill so that it doesnt obscure other objects on the slide and so on. 2 In the Basic category of shapes pick either a square or rounded rectangle.
