Hi OWO, I'm afraid there is no way of looking at PMs in the app itself. You can make a home screen shortcut to http://m.mumsnet.com/pm on your phone and see them that way, but you can't see them within the app itself. Sorry about that
I've just updated this App and it is now very difficult to use. I managed to send this message bur the link was oversized and several times it went to my email account. Also words are missing from the home page. I mean the words at the bottom telling you where each section is. It was much easier to use before I updated.