Save them in your computer, and then hit 'post reply' at the bottom LH corner after the last post on the thread. Under the text field, there is a button that says 'manage attachments' and you hit that, then the next screen has a 'browse' button, hit that and choose the folder your pic is in in the computer, then double click on the picture to attach it, then hit 'upload' and wait. It should attach when you hit 'submit'.
You may need more posts before it works right, but I see some new members posting pics sometimes so you might get it to work.