I need help with buttons

Hello,
I need help with the nav buttons with this theme
I would like to link the buttons differently . I especially want to link private messages with a button. I didn't understand how to do it.

What do I have to insert where in templates/nav?

<div class="navigation hide-mobile">
<span class="float_right hide-mobile" style="margin-right: -8px;">
......


Can someone please give me an example for private message?


THX in adavance for your patience :-)
symbio

I didnt understand what you says, is there a privite message (icon) in your header?