Hi Giuseppe,
I gather you are the gridpp user Rob Currie alluded to in an earlier email ?
If so, welcome aboard.
DIRAC installations differ slightly from each other, you can find any setting specific to the GridPP DIRAC instance here:
Would you mind trying this out ?
If you have an SL7 machine with cvmfs mounted to hand, I would recommend using the cvmfs based DIRAC UI (in a clean window!!), much quicker to test.
We have no access to the ganga setup, which makes debugging a bit difficult, so we generally don't recommend this to beginners.
I checked on our DIRAC server and it looks like you are properly registered, so there shouldn't be a problem there.
As for setting up any software inside your job:
This depends on the size of the executable (not everything can be shipped with a sandbox) and other parameters.
We have no control over were sites run their jobs, so if you write any setup it has to be relative to $PWD, there is no such thing as a home directory.
Once you managed to submit a job or three - you might want to send a script with it that dumps the environment, so you get a feel for the look of a grid environment - we'll get onto the next step, as in how to get your software where it's meant to go.
Hope that helps,
Daniela