The newest released version is v.99 but it has been abandoned.
Download this
http://globoeil.com/vgmds/vgmds099.zip
Extract New Game folder, VGRDS.nds and VGMDS.nds to the root of your card.
Download this
http://globoeil.com/vgmds/zeldemo.zip
Extract Zeldo Demo folder to the root of your card.
I'm sure the R4i auto patches.
Run VGMDS.nds, press "B" and highlight New Game folder.
This is the game editor and you can play around with it. There are no tutorials that I know of.
Press Left Shoulder to switch screens so you can select terrain to use to draw the map.
It's pretty cool and hopefully the new version he is working on will get a DS port but now that seems uncertain.