Only KanBo Managers can add new Boards in KanBo.
In case you would like to allow all users to add Boards, you can enable Openbook. This will make available to all users in KanBo (not only Managers) to create Board.
To enable Openbook, go to web.config of KanBo.Open it in any text editor.
Go to <appsettings> section.
Now change the following entry
<add key="KanBoAllowOpenbook" value="false" />
<add key="KanBoAllowOpenbook" value="true" />
Save changes in the web.config. From now all users will be able to create new boards.