Step 1: If you want, download a dock.
But if you do, follow this step. Open Ubuntu Software Center / Centre. Search "Docky" in the software center / centre. Then, download the program that matches the screenshot attached to this step, then open it in the "Accessories" category in the "Applications" menu. You can customize this dock by right-clicking the anchor and clicking settings. Add applications to the dock by dragging them into the dock from your desktop / "Applications menu"