This will prevent anyone else to see and access your folders and files.
Register Hereor login if you are already a member
You can use terminal and pass this command to do the job,
chmod -R 700 /folder_location
Or you can use chown (change owner) and do the same job. You can type for help like, man chown and press enter key. Or please link here for more help, http://nersp.nerdc.ufl.edu/~dicke3/nerspcs/chown.html