How do I set the image of a button, like I can't paste a link into somewhere and I can't find anything else that would change the picture of the button. 
Some examples:
For an image in the assets just use the filename,
myImage.jpg
For an image stored in the emulated sdcard, use a relative parh, for example image is in the root directory
/myImage.jpg
and if image is in a subdirectory
/myDirectory/myImage.jpg
Taifun