Sorry for the late reply. I dont have any source files left. To change a texture, it must be loaded into project's resources; for convenience, I keep a 2D sprite object and simply load all the textures I need for the project into its animation frames. Then, you change the texture by specifying its exact name - for example, "Texture.png" make sure to include the extension - png, jpg, or whatever format you are using at the end.