Here's a photo of the control panel on the Estes '68 with multiplex.
Rohan - When you post, just below the typing window, there's a line that says Attach; click on the "Browse" button on the right, navigate to where you have your photos stored, find the photo you want to upload, and click on "Open". When you click on "Post", your photo will show up with your post. If you click on "Preview" first, that will verify that your photo will show up when you post. Any image you post must be 150KB or less, no more than 4 images per post.