I figured it out on my own. And I'll show you how I did it.
See attachment first.
In the header template look for this>
Code:
<div id="toplinks" class="toplinks">
To the right of that add your message. Like this>
Code:
<div id="toplinks" class="toplinks"><center><p>This theme best viewed with IE9 in (minimum) 1600x900</p></center>
Click > save and reload. You're done.
Here's how that example came out>
http://www.animeappeal.com/?styleid=120
The text you put in becomes the top line in the toplinks. If you have repositioned your toplinks you may have to make some adjustments.