cant change document path

Hi
When I try to change document path and save i get javascript:void(0) and cant save the path to index the files with in it, any help please.
I am running joomla 3.4 on apache2 with php 5.4.4. and mysql 5.5.4 and using drop files for the filemanager

Kind Regards
Robert

Hi Robert,
Can you explain more details, what is the document path that you mentioned in the question.
Thanks
Dam