In case anda don't have Photoshop, anda can download it link
Now that anda have Photoshop, we can get started. First anda need to click File--->New---> width 800, height 100 pixels. Then anda click Ok and anda have a background.
Now anda click File--->Open and anda select a foto anda want to open. Then anda crop and resize it. I usually choose 110 atau 120 height. Now right click on little window and alih to new window. Now your image is in new window and anda need to drag it to your banner. Then anda use a little Arrow from the panel on the left and alih your image where anda want it.