Once you have added an image, click on the small picture and you get into an edit screen where you can add a title, a description, give a list of products used (at least for those in the Daz store) and add any tags (some contests require these).
I've attached an example.
ETA: If you do use this edit screen then don't forget to click the green "Save" button, or you will lose the title/description/etc that you just entered.
Comments
Go into your account and click on the very obviously-named option.
Here's where to find your gallery...
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Once you have added an image, click on the small picture and you get into an edit screen where you can add a title, a description, give a list of products used (at least for those in the Daz store) and add any tags (some contests require these).
I've attached an example.
ETA: If you do use this edit screen then don't forget to click the green "Save" button, or you will lose the title/description/etc that you just entered.