forum advice needed

I'm not exactly a new member as I joined back in 2010 but I've recently begun to be more active here. I have a forum process question. Looking thru the BST wheels and tires section a couple weeks ago I noticed some wheels I was interested in. But...but I don't yet have 50 posts so I can't reply in the thread AND when I tried to PM the user his/her profile did not allow direct PM's (at least not from me).

So, how do get ahold of the user? I tried posting on their profile but they never responded. I tried sending a message to the forum admin's and they told me to PM the selling user :-(.

So the wheels and tires and now sold, no big deal. But for future reference is there another way I should have handled this? I get the need for the 50 post limit and if the answer is that the process worked fine...I should not be permitted to BST, end of story, then ok I guess.