First of all, I want to let you know, that if you're a doujinka and wants to submit a doujinshi of Kuroh-Shiro, please do not submit it to the Kuroh x Shiro folder, but tell me about it instead so I can make a folder dedicated for your doujinshi only.
Why? Because it will make it neater and easier for people to read your doujins.
However, if you want your own doujinshi folder, please note that your doujinshi should at least contain 4 pages or more. Doujinshi shorter than 4 pages shall be submitted to the Kuroh x Shiro folder. Cover or AN page does not count.
Thanks for understanding.
Feel free to ask any helps or questions.