LeafEdit Pattern Editor - Universal-Team/LeafEdit GitHub Wiki
Pattern Editor Main Screen
When you click on a Pattern, you'll see this screen.

You can tap on the Pattern, to draw, or use the D-Pad + A to draw as well.
Press START to open the Pattern Tool Menu.
Pattern Tool Menu

Navigate with the D-Pad there.
Press A or touch to select.
Import Pattern
Here you can inject / import a .acww or .acnl pattern from the ROMFS or SD Card.
Export Pattern
Here you can export the current Pattern to your SD Card.
Change Palette
Here you can change the palette colors.

Change the Pattern palette with Left / Right on the D-Pad. New Leaf has a different behaviour and instructions for it will follow soon.
Press A to exit overlay.
Clear Pattern
Does nothing yet.
Own Pattern
Set Player personal stuff to a pattern. Not fully done yet.
Exit
Exit the Pattern Editor.
Export Information
That is only needed, if you like to use SuperSaiyajinStackZ's Pattern Editor Tool. This exports pattern information such as ID, Name, CreatorName etc to a file.