This tutorial shows you how to get buttons as your clan tag or buttons as your custom classes.
First: Find the A with the right side pointing up. It's in the accents.

Second: Choose one of the buttons from the list below.

Third: Press enter in your clan tag or classes and press Clan Tag or Rename again. You'll see a rectangle. Click start and you will find your button there. Repeat with any button but you can only have up to three.

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Letter Codes:
D=Y button
B=B button
S= RT
R=LT
T=Up on the dpad
O= Back button
U= Down on the Dpad
V= Left On the Dpad
W=Right on the Dpad
J = Invisible name ( Works sometimes! )
A= A button
C=X button
E= LB
F= RB
M= invisible or name is under clan Tag or makes your GT inside your clan tag its random
N= Start button
P= Ls
Q=Rs