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Nothing special here, either. Upload files, describe and sort them. Step 7 asks for the categories a game shall be user-rated in:
The following step is the proof-reading. All the data are shown once more to check whether there's errors or not.
At the bottom, you can tell the MobyGames approvers that you love them. 
After this step you can send your submission to the approvers. If you're not satisfied with what you entered you have these options, later on:
And that's about it!