For RC9500 questions, you should be using the Pronto NG forum. Also, you should start a new thread for a question not really related to the current thread.

To answer your question, the editor does not provide any capability to modify graphics. You need to use a graphics package to do that. However, if your graphic does not have any text then you can specify text to appear over the graphic - but there is only the one font with only a few sizes.