yes i can mount usb device but when i go to try make the share i can't config properly because i'm noob lolIs hard to imagine where is the problem with that few details you are giving, take a look at this wiki page
https://openwrt.org/docs/guide-user/services/nas/usb-storage-samba-webinterface
Most important things you need to check are:
-Do you have access to the USB device contents ?
-You created an user ?
-That user have a password ?