How do i drive the car?

[Dumatoin]

I have built and placed it, i put some coal into what i think is the fuel place, but not sure how i get into it. I have right clicked it and left clicked it, one of them brings up a bar of squares that doesn't fill, so, unsure what else to try.

I also tried putting flamethrower fuel and wood, but still, no idea how to get in and drive

[FreeER]

Previously answered here

hit ENTER

It was/is literally just three questions down from yours...
But everyone has to find out somehow

It is also in the controls menu (options->controls) so you can change it if you like