Ok page is updated, when I have made the new default to LAN patch on the firewall page, that link will start working. The 2.6.0 patches are still accessible as well.
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New LAN patch is there now.
If you want to edit this patch for another interface you need to use the internal interface name, WAN is wan, LAN is lan, however any added interfaces are usually optX where X is a number, typically starting from 1. Easy way to find internal name is going to the interfaces assignments screen, and hover over the link to edit the interface and check the url, it will end with something like 'if=opt5' thats an easy way to find the internal name.