You do it like this. E is 3 and then 2, meaning the Second Letter on the 3 button, then T is 8 and then 1, meaning the first letter on the 8 button and so on. So ETTX is 3,2,8,1,8,1,9,2 then you will be prompted to enter the numbers.
I am in Detroit! I waited forever and now it looks like I'm catching up. Maybe my car is faster than everyone elses! Just joking.