Sure thing! When you’re logged in, the link to your PM mailbox is in the sidebar. I just moved it up to the top of the sidebar so it would be easier to see. I don’t know what device you’re using to access the forum, but on the computer it looks like this:

Click the link that says “# messages” (#being the number of new messages you have). It will take you to the PM system.
I’ve had some reports that the PM system is difficult to find and use, and messages don’t always get through. I’m not sure why that is. If it happens to you, let me know.