1) Download and install Anki on your computer.
2) Choose the deck you want to download, then click on the arrow on the right side
3) Click on the downloaded deck, and it will open in Anki
You can easily add your own images to the decks. Just copy and paste from Google Images
If you want to merge (join) decks in Anki, you can go to the browser, select the cards, and choose "change deck".