^ No, only the mods and the SNSD members themselves have the log in username and password. When the forum open, the mods made accounts specifically for the girls. For one of the Soshified projects, they sent them gifts and gave the log in info to them.
The members knows about the forum. Tiffany, Taeyeon, Sica and Hyo have logged in at least once. Taeyeon and Tiffany both made shoutouts to Soshified once. Here's Fany's! Listen at
8:30!!!!
And the gifts Soshified sends to them are often worn by the girls too! Check the amaziness of this video:
And that's only in one year!