I can't download my mod through the mod manager. It brings up a black square with nothing on it. Help?

[BKnight49]

So, I've spent ages trying to make and upload my mod. It installs fine when I download it manually, and install it using the NMM but I can't go onto the mod page, press Download through NMM as it just brings up a black box with nothing on it. I've tried everything and it still says that.

 

What am I doing wrong?

 

This is what shows up (sorry for the large photo, 4K monitor):

 

EDIT: So, apparently you can't download it through the manager until you publish the file. This should really be something that is made a lot more clear for noobs.

 

http://i.imgur.com/SjQncvn.png

Edited April 23, 2017 by BKnight49