Click new board link to open New Board dialog.
You should define board name, mode (viewable or editable), type (public or password protected) and access password if the type is password protected.
Click Create button to create a new board.
To edit board properties you should do the following: find the board in the list and click Edit Board button right to it:
You can change the same values as while creating board. The only change is that you can delete the board by clicking Delete button in this dialog.