This page clearly states what is and what is not considered on-topic for Ask Ubuntu:
Questions that you may ask:
Using and administering official Ubuntu flavors* including: Edubuntu, Ubuntu GNOME, Kubuntu, Ubuntu Kylin, Lubuntu, Mythbuntu, Ubuntu Studio, Xubuntu, Ubuntu MATE, Ubuntu Touch, and Ubuntu "Snappy" Core.
* emphasis mine
Because ubuntuBSD is not an official flavor, all questions specific to the distro are considered off-topic.
Now to answer your question about what should be done.
Someone with a SourceForge account can contact the author using this form to politely inform them that these questions are off-topic and would be immediately closed after being asked.
As for the questions themselves, we can continue to close them as off-topic.