I used search button, and after reading several threads and more posts, found that I could use this mount -t vfat -o rw /dev/sda1 /mnt/flash
to mount and have full access to my USB flash drive in RHL9.
If you have the same issue, use this info. Don't forget to create the /mnt/flash directory (or whatever name you want) first. If you get any error, maybe must try changing the /sda1 for /sda2, or 3.... (to know for sure which device your usb drive is assigned to, use Hardware Browser, in the drives section).