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Install software:

opkg update 
opkg install samba36-server
opkg install luci-app-samba 

Clean cache:

rm /tmp/luci-indexcache

Or

reboot

/mnt/sda1 is mount point of /dev/sda1 change it to match yours.

Test Samba server:

//192.168.0.102/Shares

Make samba server writable:

chmod a+w /mnt/sda1
/etc/init.d/samba restart