My forum has features that only can be run using Google Chrome.

I want to enable a chrome logo, that says best on google chrome or something on the top I do this?

You just add a code like this:

<img src="PIC URL" style="position: absolute;left:1px;top:px;"  title="Best view with Google Chrome" />

Wehre I add code?

Any where.. homepage message, announcements, templates