however it seems blockchain.info changed their design so that tutorial, is not helping me see where to sign an address with the new design.
If you are using the new beta wallet, I think there currently is no option to sign from the addresses (that is according to my information).
Although, I don't use blockchain.info, so if that's wrong, feel free to correct me.
Are those blockchain.info addresses aswell, or can you sign from any of them?
Blockchain[.info] hasn't changed their design.
They have, if you are using their beta wallet.
https://blockchain.info/wallet-beta/#/If I move a specific amount of btc from that address to another address will that that be enough proof?
You tell me the amount and I'll move it.
or whatever you want as number.
Please help because with the new blockchain.info design there is no way to sign an address.