before you can start you have to enable cheats in the game. The easist way to do this in adding the launch option in steam.

• First go to your Steam Library
  
• Right click on RTCW and select Properties
  
• Click on "Set Launch Options..." under the General tab
  
• Add "+set sv_cheats 1" (without quotes) in the box
  
• Click 'Ok'

Once in the game you will need to open the console, to do this press the '~' key. This is where you'll input all the cheat codes in both single and multiplayer.

UPDATED: In some cases the game will tell you that 'cheat codes are not enabled on this server' when starting a single player game. If this happens simply open the console and type "/spdevmap escape1" to (re)load the first map. Now you should have no problems using the various codes from this point on.

In the console type: /name *what you want your name to be*

To change colors, include one of the following entries.
^1: Red
^2: Green
^3: Yellow
^4: Blue
^5: Light Blue
^6: Pink
^7: White
^8: Black
^9: Red

You can also use multiple colors codes in a single name.

A short list of item names to use with the /give command.

• panzerfaust
  
• thompson
  
• mp42
  
• mauser rifle
  
• flamethrower
  
• sten
  
• fg42 paratroop rifle
  
• grenade
  
• colt 45
  
• large health
  
• medium health

A list of maps to use with the /spdevmap *map name* or /devmap *map name*

• escape1
  
• escape2
  
• tram
  
• village1
  
• village2
  
• crypt1
  
• crypt2
  
• church
  
• boss1
  
• forest
  
• rocket
  
• dam
  
• chateau
  
• dark
  
• dig
  
• castle
  
• end
  
• beach
  
• village
  
• boss2
  
• rocket
  
• baseout
  
• assault,mfactory
  
• trainyard
  
• norway
  
• xlabs
  
• wine
  
• wine2
  
• wine3