There are a several ways to include a picture in your post. To upload a picture from the internet, just click on the small landscape picture icon. This will activate a dialog box where you can insert the link to your image, then click or tap on "Insert". To upload a picture from your own device, click on "Upload a File" to the right just below the post editor. This brings up a pop up where you can click "Choose File" and browse your folders for the picture you want to add. Once uploaded, you can choose whether to insert the "Thumbnail" size or "Full Image" in the post using the corresponding buttons. Once you've completed your post, click "Post Reply." Note that the picture will be automatically resized to fit the available space if needed.