There's a ? box next to the ROM Information box on the submission form.
Click it gives you more information.
I think at the minimum you need the name of the original ROM as it appears in a ROM database.
Like the NoIntro is "Kid Chamelon (USA, Europe)" and GoodGen is probably like "Kid Chameleon (UE)".
For checksum, you'd need a program that calculates it if there isn't emulators that will display it. For Windows, HashTab was recommended in the built-in help.
After installing HashTab then you can just right-click the original ROM and click properties to get the hashes.
For a normal Kid Chameleon US/EU ROM, it would be