Man I can't figure out how to add a photo 
IIRC, if you use Tapatalk, you can use the 'choose file' function below and to the left of the text box to select one from your computer.
If you don't have tapatalk, you have two other options:
1. For larger-than-1MB files, you can upload the photo to a hosting site (imgur, etc.) and use the img tag (click the button with the tiny Mona Lisa-looking icon on it) to turn the link into a picture.
2. For less-than-1MB files, you can attach it using the attach option below the posting text box. If you use this method, there will be a very small thumbnail at the end of your post that viewers will have to click on to see the image, but it means you don't need to use tapatalk or a photo upload site.