Try this if you have the sudo command enabled if not then just become root and then try this
Note replace the sdxx
with the device you are mounting it can be sdb or sdb1
sudo mkdir /home/shares
sudo mkdir /home/shares/public
sudo chown -R root:users /home/shares/public
sudo chmod -R ug=rwx,o=rx /home/shares/public
sudo mount /dev/sdxx /home/shares/public/
Once you have done running these commands open up your file browser and navigate to /home/shares/public
and all your files should be there
To find what name your system is giving to you device drive and type in terminal, as root "mount" it will display all the devices pluged in your system
Also if you type fdisk -l also will show you the list of drives and partitions in your system.
Good luck to you!