Before choosing which generator you want to use, choose a pattern you want to edit. The first generators for each pattern type are the ones you submit patterns with. When you have a pattern selected for editing, you can do so in all the generators for it's type. If you haven't got any unfinished patterns, choose the "Add New" option. When one of the admins declines your patterns (after your submission) it's automatically added to your unfinished patterns again, so you can edit, tweak and resubmit it.