Hi BL. I think you should be able to PM. I believe you hover your mouse cursor over the profile photo of the person you want to PM and click on "Start conversation". If I hover over your photo, I get the "Start conversation" button. If you don't get one for me, let me know and I will try to send you a PM, then maybe you can reply.
EDIT - You can also begin a PM/conversation (and group conversation) by clicking on the envelope button towards the top right of the page, next to your screen name and just to the left off the "SEARCH" and bell buttons. But I find it easier to do it the way I first mentioned.
I think the only limitation is a minimum number of posts, and you and I must be far over the limit.
Hope you're not PM'ing me to curse me out.