I understood anytime soon there will be a firmware update!
Basically it (mounting and using the USB stock) should happen autiomatically when you boot with an USB-stick inserted. But it doesn't happen, I have the same here (with firmware 0.1.14).
ALSO: unfortunatly when you start it with an USB stick you might not even notice it's not mounted.. You can edit and save anyway if you have system version 0.1.14. And carefull, things not on the USB-stick will be erased after firmware update.. In the admin-page you can see your firmware version right top corner.
So if you go http://192.168.1.1/admin and login with admin/changeme (change the password!) and see system version 0.1.14 then just make pages for fun but not for real I guess..