Follow the instructions:
1. Figure out what is the name of USB drive on
ls -l /dev/disk/by-uuid/
It should be like sda1, sdb2, etc. Plug and unplug to making sure about that.
2. Create a mount point whichever you prefer:
sudo mkdir /home/pi/drive
3. Give the permission for the mount point:
sudo chown -R pi:pi /home/pi/drive
Note that if you have logged in by root user, step 3 is ineffective.
4. Mount the USB drive:
sudo mount /dev/sda1 /home/pi/drive -o uid=pi,gid=pi
Bear it in mind that if you have logged in by root user, remove
-o uid=pi,gid=pi of step 4. instead of
sda1, put the name of step 1. Source.