As of now, you can burn BTC into NEWB using Newbiecoin wallet or any Bitcoin wallet such as blockchain.info by sending BTC to the burn address.  If you use any Bitcoin wallet software beside Newbiecoin wallet, The input must come from a single Bitcoin address. Be careful. It's very hard to get most wallets to send from a single input, even if you totally expect them to.

Be a suggestion for security, we recommend to use the new BTC address which is generated in Newbiecoin wallet when you first open it. You can send a little BTC from your existed wallet such as blockchain.info to the new address, then you can burn a small amount BTC for Newbiecoin in Newbiecoin wallet.