Instructions
Reach the 15th level of prestige. In "Call of Duty: Black Ops" you gain experience the more you play multiplayer mode. If you get enough experience, you can level up your character and unlock weapons and perks. You can get to level 50 before the game will ask you if you want to "Prestige" and start over with level 1. Choose to prestige and repeat this process 14 times to unlock the "Color" option on your clan tag.
Enter the "Multiplayer" lobby as you normally would once you reach the 15th prestige level. Select the "Live" option and then sign in to your account linked to the PlayStation network. Once you are logged in, choose the "Playercard" option from the main menu before you choose the "Join Match" option.
Scroll down to the "Clan Tag" option under your playercard. Here you will be able to edit the text that makes up your clan tag. Enter in the text that you want to use, or if you do not want to change it, just select the "Enter" option to keep what you have and move to the next option.
Choose the color from the list in the next menu that you want to apply to your clan tag. You can choose between, red, green, yellow, blue, cyan and magenta. Highlight the option you want and press the "X" button to choose. You will be taken back to the main screen where you will see the changes applied.