In this short tutorial, I will explain how to export your private keys out of your Multibit Classic wallet. This tutorial does not apply to Multibit HD.
Open Multibit and make sure your wallet is selected. In the menu, click on Tools and on Export Private Keys.
A tab named Export Private Keys will appear. In the Wallet password text box, enter your wallet’s password. Click on Export to… and choose where your private keys will be exported. Select Do not password protect export file and click on Export private keys.
Your private keys will be exported to a file at your chosen location. Open it. Your private keys will be listed on the left.