transcriptsToOrfs

Hi!
I’m newbie of galaxy tool.
nice to meet you.

i have to analysis RNA-seq data using transcriptsToOrfs
so i search on google and go to http://galaxy-dev.cnsi.ucsb.edu/osiris/

then i upload my fasta file and run transcriptsToOrfs.
but it occurs error message “You must set the environmental variable TRINITY_BASE_DIR to the base installation directory of Trinity before running this”

what can i do?