Personal messages are located in the Forum.
On the menu bar near the top of the TuDiabetes home page, one of the choices is "Forum". (see below)
Clicking on that button will take you directly to the Forum.
Near the upper right of every Forum page, your personal icon will appear. If you have any unread personal messages waiting, a small green circle appears just above and to the left of your icon. In the example below, one message is pending.
Click on the your personal icon and a drop down list showing recent activity will appear:
The screen name (in this case, "David_dns") appears on the left. Click on it and you'll see a screen that looks like this:
Now click on the word "Messages" and you will see a list of your pending messages. In this example there is just one, with the subject line "This Is An Example Of A Personal Message".
Click on the subject line and the message will be displayed.
. . . and that's it!