um, i don't mean to be rude, but members aren't allowed to submit art with the current settings.
you can go to the admin area, click 'manage members', under that, click on 'members', and in the section titled
'On Gallery, Members:' click the dropdown menu titled 'Submissions to "Featured":' and click 'Are Automatically approved'.
sorry if my explanation was hard to understand, heres a better explanation X3:
help.deviantart.com/430/