Browse to the folder you want to share. Right-click on it to open the contextual menu and click on Sharing Options.
The Folder Sharing window will open. Check the box next to ’Share this folder’. Then, in the Share name field, type the share name you want to use. In the Comment field type anything you want or just leave it empty - there’s no need to complete it. If you want to allow others to create and delete files in the folder you are sharing, check the box next to ’Allow others to create and delete files in this folder’. Also, if you want to allow Guest access, check the box next to ’Guest access (for people without a user account)’. When done, click on Create Share to actually share the folder.
If you have selected the option ’Allow others to create and delete files in this folder’ a pop-up shows up, asking if you want to add some permissions to the folder you are sharing. Click on the ’Add the permissions automatically’ button. Now, the folder is shared with the rest of the network.