<%=If(Metric=0,"This is text to display.","")%>
After swapping out the Metric and text string to display, enclose the code snippet within whatever <font>, <p>, <div>, etc tag and you should be golden. Don't forget to terminate your opening tag, too, something like this...
<p><i><span style="font-size:13px;color:blue">
<%=If(Metric=0,"This is text to display.","")%>
</span></i></p>