Hi Matthew, and welcome to WAB.
Your photo of a Dunnock is in the image library. (You can access the image library from the
Gallery, by clicking on the tab at the top).
You can also access the image library, and copy the photo into your posts by clicking on the blue "Image Library" link, which is located at the right hand side of the "Post Reply" text box, when you are adding a post, or starting a thread.
You just click on the thumbnail, and the photo gets added into your post.
Regards
Mike.