volví al Kilómetro Cero donde empiezan todos viajes y en el mapa en el centro de la rotonda debajo donde estaba escrito Usted Está Aquí he añadido Pero Tu No Estás
Then I translated it, with a small change to the last line.
i returned to Kilometre Zero where all journeys begin and on the map in the centre of the roundabout underneath where it was written You Are Here i added But She Is Not
I had to alter the line, because "tu" also translates as "you", which would have been confusing, but I think it's less good in the English version.