First: If I don't hear back from you in a few hours, I'll change your name to "Express1". But you are free to try a other variations that you may like better, if you want to, using the following method:
Go into the "Friend list" tab, then add a name in the text box below and click on "Add". If the name exists, it will be added to your friend list. You should then remove it from your friend list, but know the name is taken. If the names does not exist yet, you will be given an error message.
Since I have many friends and only a few people blacklisted, I actually do that on the "Blacklist" tab, because that makes finding an added player much easier for me.