Question about settle a bus

Question about settle a bus
 

Hi
i fly tommorow to spain, and i want to settle a bus online

when i want to pay, the page says this in a context:

Este autobus no numera plaza

what does this mean?

No bus at that stop number?

Kind of late, but it means that there are no numbered seats in the bus.

Probably it means that seats don't have numbers, so you may be seated in the back of the bus or not, next to the window or not, probably depending on the time you arrive to the station or you get into the bus.
So even though your ticket has been bought in advance you cannot be guaranteed that you will choose your seat, but you have a seat on that bus.

Hope this is helpful :)

In the US we might say that the bus does not have assigned seats.