I’m new to this as well, but if i am correct, you look for add an object, then you should fine fibonacci retracements in the categories.
A Swing High is a candlestick with at least two lower highs on both the left and right of itself.
A Swing Low is a candlestick with at least two higher lows on both the left and right of itself.
The best is to watch some youtube videos, you will see its not complicated. Generally speaking its very simple on MT4: Mouseclick here, Mouseclick there, thats it