you can't change it from .png to any format... the drawings have to be saved with one of the type of files (like .rmd for flash, .chi for java, and .rmdc for canvasdraw) to be able to be uploaded to the site~
I made a drawing then saved it to my PC now I can't load it on the site as it is not the right format? Its saved as png. How do I go about changing it and loading it? 
Copyright Mixart New Media LLC.
As creators of drawings, you own the rights to your own drawings. Respect copyright protected artwork.
More information in our Terms and Copyright Policy.
About RateMyDrawings Terms & Conditions Advertise on RMD Privacy Policy Donate Behavior Guide