The folder's settings have been changed, you should be able to submit now.
How to contribute to the group's gallery -
1 - Go to the Gallery
2 - Find the folder you would like to submit to
3 - Select 'Submit to this folder' and 'Contribute an Existing Deviation
4 - Select the amazing piece of work you would like to share
5 - Sit back and wait for some comments, or submit another work!
twinchesterz