how can you change you name in the game i tiped in the console: /name but it didnt workt

Look at the UCP (User Control Panel) and there's a option to change it

ucp.php?i=profile&mode=reg_details

 

Go here and change your username, after that your in game name will change. You will have to change your login details for IW4M/IW5M, do this by deleting iw4m.ini and iw5m.ini in their respective game folders, and logging in using your new username when prompted.