If you change your name to include the LS it will do it for all of your games. What you have to do is when you start up your wii u on the upper-left you should see your mii icon. Click on it then scroll down until you find edit mii. It's up to you if you want to change your mii or not but after you do that you can change your mii name. Your mii name is your name in splatoon then you'll be able to include the LS in your name. It's up to you weither you want to use your real name or a user name though all of the LS members so far have user names. Let me know if you have any other questions.