ClaraKay,
You should enable private messaging in your "User CP". I typed up a nice greeting and then realized I couldn't send it to you.
The "User CP" link is at the top of the page, "southwest" of the S in Nexus
On the left side of that page under "Your Profile" you'll find "Edit Options"
In there, you add a check to the, "Receive Private Messages from Others"
...In case you want to change that anyway.