to be clear, in order to tag your bitcoin address on blockchain.info you don't need to have an account with blockchain.info! the only thing you need to do is to sign a message that it gives you which is basically this:
Blockchain.info Address Verification 2018-05-15
and the result will be something like this one:
https://blockchain.info/address/1N5AotTR8hzoNL72zVDnNgbYxtwQ8spzg9it shows "2bSunnySaini30" instead of the address.