Yes, PhotoFiltre can actually edit images because it offers the basic tools to do this. For example, you can use background filling, stamp tool, smudge, artistic paintbrush, layers, effects known as filters (using Filter in main menu), etc. This is useful if you want to edit an image without installing other applications that require additional knowledge.
Use the Tutorials page to browse through available tutorials to learn to edit images: http://www.photofiltre-studio.com/tutolinks-en.htm