I have got a couple of messages saying, that I have got a private message. However it comes, but I am not able to open/read the messages, the programme tells me, there is a popup blocker or something. Which address in the popup blocker should I free/open?
You don't need to read it strictly when it pops up. You can go to the upper right hand side of your index page where it will say Private Messages. Click on it and it will take you to your inbox.