How can i name my licence plate

Hello,
I see some people with personal licence plate (like your name) and i wanna know how and where it's possible to do it ?
Thanks for your answer

 

Go to parts, the bar to put your name is in the bottom.

 

Is it in the garage or option ? I don't find it

 

It's in parts configs.

 

You can also access it by pressing ctrl-w or pressing the esc button and find the gear called Vehicle Config

 

thanks