How exactly do you submit your idea for an issue? I noticed some issues are user submitted, but I can't figure out how this is done...
Check out this announcement answering your question - http://www.nationstates.net/forum/viewtopic.php?t=142366
You'll have to wait a few months.
Alright, thanks, but like will there just be another option added to the menus once the population hits 500 million? Or do you still submit it somewhere?
When you hit 500 mill, there'll be a little link under the list of issues saying "Want to contribute an Issue to NationStates? Do it here!"
It's pretty clear from there.