First navigate to the profile tab

Click on Edit Clan Tag

type ^ followed by a number 0 to 9

Every Symbol and Color That Works
^1 - Red
^2 - Green
^3 - Yellow
^4 - Blue
^5 - Cyan
^6 - Pink
^7 - White
^8 - Cyan
^9 - Red
^0 - Black
^% - Light Green
^& - Yellow
^* - Purple
^( - Light Green
^) - Light Blue
^- - Baby Blue
^+ - Orange
^. - Very Light Green
^, - Burnt Orange
^' - Gray
^; - Navy Blue
^: - Green

{x} - X key (Works with any keyboard letter and number key)

߇ - Left Stick
߈ - Right Stick
߉ - Left Stick
ߊ - Right Stick
ߋ - Left Stick
ߌ - Right Stick
ߍ - Vault Arrow
ߎ - Dpad
ߏ - Plus
ߐ - Minus
ߑ - White Caution
ߒ‎ - Two Arrows
ߓ - Two Arrows
ߔ - Lock
ߕ - Skull
ߖ - Cod Point
ߚ - Up Arrow
ߛ - Down Arrow
ߜ - Left Arrow
ߝ - Right Arrow
ߞ - Mouse 1
ߟ - Mouse 2
ߠ - Mouse 3
ߡ - Mouse 4
ߢ - Mouse 5
ߣ - Mouse Wheel Down
ߤ - Mouse Wheel Up
ߥ - Mouse
ߦ - Activated Mic
ߧ - Ammo
ߨ - Orange Caution
ߩ - Crosshair
ߪ - Skull w/ Lightning
߫ - Unlock Icon
߬ - Square w/ X
߭ - Square
߮ - Arrow Circle
߯ - Noob Tube
߰ - Underbarrel Shotgun
߱ - Scroll Wheel
߲ - Right Mouse w/ Arrows
߳ - MW2 Key
ߴ - Hitmarker
ߵ - Party Icon
߶ - Gunsmith Icon
߷ - Green Checkmark
߸ - Yellow Arrow Circle
߹ - Yellow Paper
ߺ - Red Caution
߽ - Stealth Bomber
߾ - VTOL Jet
߿ - Wheelson

Clan tags can still be used like normal