STEP: 1 Go into your Administration Panel => Users & Groups => Rank --> Rank Administration

Rank Title: put this in

Code:

<span class="adm">Administrator</span>

As you can see on the above code has a class "adm" witch we will use that for the second rank by using CSS.

STEP: 2 Put this CSS code in your CSS Style Sheet:

Code:

.adm:after {
    content: url("Rank_Image_Here");
}

STEP: 3 Rank Image URL: put that other rank you want to give to them.

Once you have finished everything, click save and you're done.