Firstly ensure that system-config-samba is installed (refer to this post for install instructions).
Click File -> Add Share
Click Browse and select the folder to be shared
Insert a share name for the folder to be shared
Check "Writeable" and "Visible" if desired
Click the Access tab and allow access to everyone
You can of course restrict access to a specic user if you so choose
Click OK
sudo nano /etc/samba/smb.conf
Scroll to the bottom of the terminal window and you’ll notice the share name you created there. Add the following line at the end of that section:
force user = YOUR-USERNAME
sudo service smbd restart