Hi Ramiro.
how should I name folders containing the tours in .pano-runner
It doesn't matter. You can give sub folders whatever name you like. See my post above.
Pano Runner - Android App for Krpano
and how should I store there?
That also doesn't matter. You can store files however you like.
wich index.html should contain hyperlinks to subfolders?
Now this is very important. The index.html file that contains the hyper links must be located in the top most folder of the .pano-runner folder as shown in my post above. If you do not do this you will get a white screen.
How do I change tour?
You press the back button and click on any one of your hyper links.
I am having the same issue launching Virtual Tours from the SD Card: White screen
When you understand all of the above, the exact same logic applies to the SD Card.
I will try to make a download you can just copy into the .pano-runner folder tomorrow that demonstrates how to store more than one tour.
Regards
James