Tutorial on how to import a paper wallet into blockchain.info and send a transaction with message attached then delete it?
I know it's a few months since you've asked, but just in case someone else is looking for it. If you have a paper wallet, the easiest thing is to import it into a desktop wallet, and from there you can send your BTC to someone or to an exchange or to another wallet, like the one on blockchain. Some online wallets allow importing the private key but the one on blockchain doesn't seem to - at Least I haven't found a way after looking around.