I'd say we are mixing all information here. What OP wants is just how to rank a map, and pulling the BN application only makes it more confusing than it's supposed to be.
Just say that "kudosu is basically unecessary to rank a map, it's replaced with the hype system" and you're pretty much answer OP's problem.
To OP:
You need to have others hype your map (at least 5 hypes) before you can ask BNs to check.
At this stage, modding alone won't help anything. Go to Modding Queues or DMs, ask for feedback first. That way you can find the problem you're in and improve it in the next map.
Also, do not rank your map just yet. You still have lots of things to learn before making an actually decent map, if BNs check your map they will say pretty much the same.
TL;DR Map more first.