Hello,
1. Download the resource (gradients / patterns / etc.)
2. After that you must copy / cut them in those folders:
For gradients : Adobe Photoshop -> Presets -> Gradients.
For brushes : Adobe Photoshop -> Presets -> Brushes .
For patterns : Adobe Photoshop -> Presets -> Patterns .
And there you can find all folders for any resource .
About the border :
Select the Postage layer, and then use the Move tool () to drag it to the middle right of the image .
Select the layer in the Layers panel, and then click the Create A New Layer button () at the bottom of the panel. Choose Select > All. Choose Select > Modify > Border. In the Border Selection dialog box, type 10 pixels for the Width, and click OK. A 10-pixel border is selected around the entire image. Now, you’ll fill it with white. Select white for the Foreground Color, and then choose Edit > Fill. In the Fill dialog box, choose Foreground Color from the Use menu, and click OK. Choose Select > Deselect. Double-click the Layer 1 name in the Layers panel, and rename the layer Border.