First, Load your image inside photoshop CS5.
1. Now, press ALT and keep it pressed while double-clicking the background layer box on the layers pallete. (Not the thumbnail area but anywhere in the box). You should see that from seeing "background" it now shows "layer 0" as the name of the image box. The reason why you do this is to "unlock" the image layer to make it editable and movable.
2. Now, press the small "create a new layer" button on the layers pallete (beside the trash can button) to create a new layer. This new layer will now be the layer that you will use for your frame. It is labeled "layer 1" by default. You will also notice that is was placed on top of layer 0.
3. Now, click "layer 0" and drag it above "layer 1".
4. Click layer 1 to highlight it.
5. On the tools palette (left side of your CS5 window, select the CROP tool. Start dragging your mouse from the top most left part down to the right most down part to select the whole layer 1 image area. You should see control handles appearing on your image boundaries. This control handles are adjustable. By adjusting them, you can actually increase the size of the image area without entering any numerical values. By simply dragging the handles (small squares in the middle of the lines) outward that determines the "extra" image space for your frame. Once you're done with the dragging (top, bottom, left and right) just press enter to let CS5 accept this new image size.
6. By default, you would see a new transparent area extending outside the image area. If you want to color it white (or black), just use the "paint bucket tool" on the tools palette and then click it anywhere the frame area. This action will fill the frame with the color you selected.
That's it! Once you get the hang of it, it will only take you less than 2 minutes to finish the whole process.
7. If you want to make it "fancier" you can add some drop shadow effects to the original image area and you can also add your own copyright logo or signature on the frame area.
Hope this helps. If the instruction is a little bit confusing, wait for other members to tell you their own way of adding a frame to an image. Good luck!