I've been messaging with another member about the same item, with no issues. It looks like any other PM, it's in my in-box, and the page the message is on says "private messages", I'm just not seeing any way to reply. Here's a link, if that's any help....
https://www.theoutdoorstrader.com/conversations/burris.6426768/
https://www.theoutdoorstrader.com/conversations/burris.6426768/