Okay, lets start.
Go to the "rocks" folder (or any other folder, rocks just have a more basic code i guess you could put it) and see that .material file named "rock.material"? First copy and paste it then right click it and choose open. It wont open will it? There should be an option asking you to use a list of installed programs. Choose that options and Notepad should be there. Yes, the file needs to be opened with Notepad.
You will see a whole list of all the rock materials. They would all look similar to this...
material rockMat
{
technique
{
pass
{
cull_hardware none
cull_software none
texture_unit
{
texture rockTex.jpg
}
}
}
}
Name your material here, rockMat is typed into the Material box in Object Maker to bring the texture up. Make your own by replacing this rockMat with something of your fancy.
Type in the name and format of the image you plan on using.
You can delete the rest of the other codes if you want, so its just the one like i have above.
When your ready to save do so by clicking "File>>Save" NOT "Save as" but just "Save". You can rename this file if you want and move it elsewhere.
If your wanting a transparent texture this code wont work.