STEP 1
____________________________________________________
In the first thing you must have this program: SA GXT Editor
STEP 2
____________________________________________________
Now, open the program and press "Ctrl+O" and open the "american.gxt" from "\GTA San Andreas\text"
STEP 3
____________________________________________________
In the "Table Name" make shure for the next step that is always selected on "MAIN"
Press "Ctrl+N" and search what do you want for example "Banshee"
In the bigest field start putting your desired name
That's all!
Enjoy!