It can be from the Web, another document, or your photos library.  If your Mac doesn't have a right click function, Control+click or click with two fingers on your trackpad. Do so near the place you want to insert the picture. The image will be placed in the Word document where you clicked.  Click and hold on the photo to move or drag it to another location. You can also edit the image in the Word document.

TL;DR in Indonesian:
Carilah gambar yang ingin Anda salin. Klik kanan gambar yang ingin disalin. Klik pilihan Copy. Klik kanan dokumen. Klik Paste.