Download qbittorrent:
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I assume that you're using windows?
If so
->Windows->get the 64 bit one(just x64, no bs like tt20 or whatever) -> go to nyaa and click on the game/anime you want, simple as -> click on "download torrent" next to the little magnet icon, you can use the magnet link too if you want-> it will then download a *.torrent file that you can use with qbittorrent -> open qbittorrrent -> click on the plus (+) symbol to open a torrent file -> choose the torrent file -> a window will pop up listing the files from the torrent -> click ok at the bottom right corner to start leeching.