Go to Document > Signatures > Sign Document. Click and drag a rectangle to define the region where the signature will appear Choose the Digital ID to sign with. For PKCS #12 IDs, enter the Password and click Log in Under Signature Type, select Digital Signature. Complete any of the desired Options fields.
If there are some other programs you use, you will have to make sure that it reads the XML files. I do not know if OpenOffice can read these, though. To test drive this plugin, open C:\Program Files\Burnett Barbarian\Bourne The Barbarian.exe, and make sure that, on the bottom left, there is a button to launch Blue Beam. If you are playing on a Windows 7 Machine. Click on Action button and if you don't see Blue Beam there, close Action and launch your BG. And you will see Blue Beam in the Action Menu. If it does not appear, you must uninstall Action. For Mac OSX, it will require some extra steps to launch Blue Beam. You can find instructions in this thread. If you want to use a different game, you will have to use another version of Blue Beam. For example, for Balder's Gate II, the Blue.