I have been making a night version of the grassland background and have been trying to find a slot to put it in. All of the other background slots are in use and I have already messed up all of the unused bonus room backgrounds trying to find a slot . When ever I try to import a background into an empy slot, the editor does nothing (when I click the 'import PNG' button, nothing happens). Please help!
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Check out my YouTube channel: VideoGamePhoenix

Use the change file button. In the textbox write the file ID of a file inside your ROM you don't need anymore. Then you can use that BG slot.
You need to use NSMBe 5.1, if you want to use that function.

Most people used to use the minigame files ID to place new backgrounds, but as a result, the minigame wont work anymore.
So if you want to sacrifice the minigame files, you can add BG to the empty slots.

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There are also unused beta files in the ROM. Just search them and replace them. This way you want have to sacrifice something important.

wait wait wait.
Backgrounds don't use one file ID, they use THREE.

So if you enter file ID 123, then it will use files 123, 124, 125.

So you have to use three unused files with consecutive IDs

Thanks for that. Did not know that before.
I always thought you would somehow put 3 files inside one. So you actually replace three files with that technique. <_<

Which Build is 5.1?
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Check out my YouTube channel: VideoGamePhoenix

You cant find it anymore. I searched it some time ago too, but it seems that some wise guy deleted it .
Does not matter, no one needs it anymore I guess. Change File isn't as important as it seems. You have enough tilesets and background slots anyways.

It's... oooold.
It's from waaay before this forum existed

But I'll make a similar (better?) feature in NSMBe5.2. Dunno when, but it's on the to-do list.