To send an encrypted memo, just send me 0.001 Steem or SBD and in the memo field, begin it with a #
For example, in the memo field (without quotations) write "# this is the message that you want to send me that will be encrypted"
To read an encrypted memo, log into steemitwallet.com with your master passphrase and it will allow you to read any memos sent to you that are encrypted.
Also nope these are totally anonymous :-). No need for personal information at all.