Hi,

If you look at the install directory of NSP or NS2.0 you will see a directory structure like this;
C:\Program Files\Nevo\NevoStudio Pro\gallery\Buttons\

Open one of the folders and you will see that for each button there are two files.
E.G.
button1_blue_L_0.png (up state)
button1_blue_L_1.png (down state)

Put your button images into the "User Buttons" folder or create your own new folder.

If you follow this naming structure (_0, _1) then an image can be used as a button.

If you do not have an up and down button then put the images in the symbols directory under the "user symbols" folder.

D