Mmk, well it does have to do quite a bit with coding. First things first, make the leaves you want to make. Label them a different name, but similar to the original. Like oakLeafFall or something. (I presume you are using the oak tree, however it works for others as well) Now, open up oakTree.material in notepad. You'll get a bit of text, the first thing on top being 'material OakMat/Leaf'
Copy all of that to the last '}'. Paste it in the same notepad however rename the 'texture oakLeaf.png' to the new image's name. So 'oakLeafFall'. Also rename the 'material OakMat/Leaf' to 'material OakMat/Leaf2' And make sure if you know if the image is a .png or .jpg. That makes a difference.
Save and then open up FH.
You'll go into object maker and load up the oak tree. The second tab will be the .mesh input. Under is where you'd put in the material section 'OakMat/Leaf2,'. And it should work. Hope it helps. I don't have any screenies and I'm not exactly best at explaining things.
