I just SAVE them to my SM Album. Then open a seperate tab to the Forum and in one tab I open the pic I want to link to a post - URL will show up...I copy that URL and paste to the post I want to respond to under the other tab (using the photo attachment icon).
No doubt there are other methods, I'm just accustomed to doing it this way.
Click "Go Advanced" and then "Manage Attachments". If you don't get a popup with "Choose File" buttons, you may have to make the site an exception to Safari's pop-up blocking.
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N8SRE
1990 E-250 Sportsmobile w/ penthouse top, converted when new by SMB Texas.