Click Settings Next in the Top Right
Click Submission Folders under the Bold Preferences
Name your Folder and Click Create Folder
Go to an Already created Submission in your Gallery
Go to Submission Management on the Right of your Submission and click Edit Submission Details
Choose the Folder you have Created for your Submission and *Update your Submission**
Also, Once you have a Folder Already created, you Can always, When Submitting a New Submission place it into a folder from the Submit Menu. ^_^