Hi there, welcome aboard - and thanks for the comment
Two ways to add photos to your posts:
either resize the photo to a maximum 640 pixels across and then use the 'Add photograph or map' tab below the posting window to upload it. You can then set a caption and choose where to place it 'inline' (where to put it in your post).
there is a way to show the photo directly from Flickr but I can't work out how to see the photo filenames on Flickr - someone else may be able to help if you prefer to do that.