On nanowrimo.org, here is how you can look up your NaNo UserId and NaNo Handle. Your UserId is usually all lowercase and has no spaces because it is used as part of a URL when you use the MY NANOWRIMO drop down menu and select Profile. Your NaNo handle can have upper case and spaces--it is how your username appearsl
You can see in this example that my profile page is at nanowrimo.org/participants/newmexicokid so my NaNo UserId is newmexicokid (all lower case). Appearing on the page itself is my NaNo Handle (NewMexicoKid).