All you do is set two options listed above to YES.
Originally Posted by Zachariah
Admin CP options:
Category Options - per Cat created.
Act as Members' Category- [ ] yes [ ] no
When set to 'Yes', any uploads to this category will automatically be placed in a sub-category named after the user who uploaded the file.
Allow Users to Create Sub-Categories - [ ] yes [ ] no
I have not tested all the options.
Then check the usergroup permissions to make sure you allow them to create categories.
When they create a category, they'll choose the Members Gallery as the parent, and the new sub-cat they create will show up under their member gallery, under their name.