Custom Header PNG image – not transparent

Hi,Im just getting back into blogging, its been about 18 months since I lasted Used wordpress so i am a little foggy!

I downloaded the adelle theme for my wordpress blog which I love and have been playing around with custom header. I created this in Photoshop and saved it as a transparent png file. However it is not transparent and the background appears to have been filled white.

I also have this issue with my text widget on the right panel, whereI have added a a text box and added an image for the about me box.However again although this is a transparent png also it has a filled white background.

Any solutions?