From the Tools screen select "About MultiBit”.
The About screen shows the current version of your installed MultiBit. This is very useful to quote in any support issue you raise with us.
You can access our site, multibit.org, in your browser by clicking on the button labelled 'Visit our site'.
You can donate to MultiBit by clicking on the button labelled 'Donate now'.
Also on this screen are tips on the need to secure your computer when you use bitcoin and on MultiBit's open source licence.