To put a vertical banner on the right, you'll need to change the layout to create room for it. Go to Admin Panel -> Themes -> Manage Templates -> "Wrapper". The simplest approach would be to change
<!-- BODY GOES HERE -->
to <div style="display: table;">
<div style="display: table-row;">
<div style="display: table-cell; vertical-align: top;"><!-- BODY GOES HERE --></div>
<div style="display: table-cell; width: 200px; vertical-align: top;">{SHOWAD[2]}</div>
</div>
</div>
<div style="display: table-row;">
<div style="display: table-cell; vertical-align: top;"><!-- BODY GOES HERE --></div>
<div style="display: table-cell; width: 200px; vertical-align: top;">{SHOWAD[2]}</div>
</div>
</div>
Change 200px to whatever the width of your vertical banner is and 2 to whatever slot number the ad is in the ad manager. To make the HTML cleaner, you could optionally move those inline style definitions to the stylesheet.