The currency ticker is the small table that appears in the top right of the MultiBit screen. It shows the value of 1 bitcoin in various currencies. You can configure the ticker by clicking on it. This opens the 'Preferences' tab. Scroll down to the 'Currency ticker and exchange rate' section.
In the 'Currency ticker and exchange rate' section you can:
Select the 'Show currency ticker' checkbox to show the ticker. Unselect it to hide the ticker.
Select the 'Show bitcoin converted to fiat currency' checkbox to show fiat equivalents of your bitcoin amounts.
Select which columns you want to appear in the ticker.
Choose which exchange and currency to show in the first row of the ticker. This currency is used for currency conversions if you have it enabled.
Add a second row to the ticker and choose the exchange and currency to show.
To make the changes appear, click on the 'Apply changes' button.
You can quickly show or hide the currency ticker by using the 'View | Show Currency Ticker' and 'View | Hide Currency Ticker' menu options.