You probably won't find users by using the search bar of the website, but it's easier to use either the address 'invalid777' suggests with the username you look for OR use Google to specifically search the part of the website called "armorgames.com/user" and a partial or complete username. =)
Oh yeah and if you use the URL thingy, uppercase/lowercase doesn't matter. So, armorgames.com/user/iNvAlId777 will give you the same thing as armorgames.com/user/invalid777.
