Okay:

You go to https://steemworld.org/@ceramixer.

Click on BALANCES on the left side, under STATS. Than pops up a new view; on the right side you click TRANSFER.

You choose STEEM, to account @ubongudofot, 0.001 Steem, in the Memo-field you write a message (e-Mail-adress or another contact).

Then click the check box ENCRYPT MEMO:

You will be asked for your Memo Key. Then you send the Message private ;-))

Try it out!