Setting image to transparent background in Painter Essentiasl 7

My daughter mad an image for my friends twitch. We need it in a transparent background and also need to know how to do this for future images as she does my emotes as well. I have looked up tutorials on YouTube and have looked here for any help but no one seems to have an answer, so, if someone DOES have an actual answer to this, that would be great. I can post the image if that helps. We already sent the original image to my friend and I told her I'm working on a fix for the image.