No problem at all! I'm not sure I entirely understand the question so please bear with me. If I am understanding you correctly, you are asking what happens if you find something uploaded on another website that isn't uploaded here? I'm not sure you are allowed to honestly, it is against the rules to post things ripped by other people. Ask an admin first to make sure, but you might be okay if you get permission from the original ripper to host their work here. If you get the original ripper's blessing make sure to credit them. You can try posting questions in either the
Site Discussion forum or the
Sounds Resource forum to contact the admins, but it probably would be faster just to contact them directly by PMing them.
The posting process after that is pretty simple, there is a tutorial
here. Don't worry about it being specifically for the Spriter's Resource, the process is practically the same across the board. You may also want to take a look
here to make sure your submissions meet the site's standards. I don't think that
Sword Art Online: Memory Defrag has anything posted yet. If that's the case you'll probably want to make an icon for the game (it makes things easier for the admins which makes submissions go smoother). Basically the icon just needs to be a screenshot of the gameplay of the game, just to give everyone a feel for what the game is about. The icon needs to be 240 px by 125 px and saved as a .PNG. If you need any help with the icon feel free to PM me.
I hope that helps! Let me know if you have any other questions.