Plug in your flash drive and then go to /dev folder and see if you can see any device named sda or sda0 or sda1.
I'am assuming that you see a device as sda1
Go to /mnt folder and make new folder named usb (you need to enter as root or su)
then go to /etc/fstab file (as root or su) and make the following entry in your
/etc/fstab file :
/dev/sda1 /mnt/usb vfat,user,noauto 0 0
Click on usb drive under /mnt folder or konquerer, you should see the contents of your drive