[galaxy-dev] How set the working and temp directories in external drive

Hi, now I am trying to set the working and temp directories of Galaxy enviroment in a external drive, but I do not know how to do this task. I know that universe_wgsi.ini file has a section called Files and directories, with diferent options like job_working_directory, collect_outputs_from, file_path and new_file_path. However, I do not know if these are the options to be set or if there are other options. I also do not know how to set these options. Can anybody help me or point me to a tutorial? Thanks