Win7 Homegroup networking permission issues

I currently have a HomeGroup setup between 2 PCs running Windows 7. They have read permissions for the shared folders, but I need to enable write permission. In other words, if I'm on PC1, I need to be able to save, rename, delete and modify files on PC2 over the network. How do I change the permissions on the shared folders to allow users over the network to have full control?

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