Eh.. not sure what there is to walk you through. I assume you mean the entire Taskbar has been moved and not just the start button itself (which I don't even think is possible). You want to move it back to the "bottom" of the screen and if only the Start button were moved to the right, you wouldn't want to move to the bottom of the screen, it'd already be at the bottom just to the right. So, working off that assumption:
Right click the Taskbar and make sure it's not locked, then just click and hold on it and move your mouse to the bottom of the screen.