Thanks vidista
I contacted to my hosting provider and they told me my path is /usr/bin/ghostscript
however after “saving changes” in the advanced settings tab it redirects me to a not found page and changes are not saved. any suggestions?
Moreover, my hosting provider told me aswell to check that the plugin doesnt use the exec() command since it can compromise my web security. Do you have any idea about this question?
Excuse my english. BTW My knowledge in wordpress is by trial and error. I am no expert.
Lots of thanks for your answers. You help me a lot.