Where do I insert these files? How to start this block?
You need to replace previous blockchain with this and restart the daemon after with this new item. Usually, files are stored in $HOME/.bitnote (Such folders can be seen with Ctrl+H through your linux desktop.)
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BoardAnnouncements (Altcoins)
Re: [XBN] Bitnote: the secure, private, untraceable CryptoNote based Cryptocurrency