octaafdebolle

Hello, For a Wikia page i want to create a new design for the menu. Therefore i want to make a png. picture transparent. The letters with welcome are green and the background is white, but everytime i use the magic staff tool it selects both colors and therefore i can't remove the white background and save the green letters to be saved as a transparent picture. Can somebody help me to explain what i am doing wrong or can help me?