You're doing great and I would love to help you learn. I have recently had my first kid and find myself with little time to work on things, unfortunately. We need someone with a passion for Image to help take on editing or even over administration and I would love to help train those that can help carry the torch on.
Usually all the buttons for the templates are above the page in edit mode. So clicking edit on any page will show you what templates are available (for the most part). There is one for images if you click it. It's also proposed when you upload an image via "Contribute -> Add a Photo" on the upper right hand side of the screen.
Keep up the good work!