I read her post in local forum, he worried because her address can't sign message (he is using local wallet). I have same problem to her before I try to stake my bitcoin address but somebody told me that can't stake because it start with 3,
They recommend to me that make another wallet that can sign messAge at included you local address.
Bitcoin addresses that starts with '3' are multi-signature wallets. If you want to have a wallet that is capable of signing messages but don't want to download any wallet (which is, well, a bad idea) you might try and use online wallets such as blockchain.info. There. their wallet have the functionality to sign a message without having to download one in your machine.