Assuming the Windows version you should be able to
1. Create a player online (new player).
2. Check a ticket out with that player on it. (tools:offline/ticket). Save it to disk.
3. Double click on the file you download to play the game (assumes you have installed the game first).
4. When finished upload the ticket (will be in the tickets directory where the agme is installed and named "ticket.bd4". Once uploaded I suggest renaming the file to avoid playing on a ticket that cannot be checked in.
That's, in short the process. In the future I'll be rereleasing the Java version to allow playing in the browser while online.
Steps 2 and 3 can be combined by opening rather than saving to disk. The above will work if you check out the ticket from one machine and want to play on another. It also prevents the game from launching at the time.
If you are playing the UNIX version either type "bd4 newTicket.bd4" or move the newTicket into the tickets directory and call it "ticket.bd4". This also works for Windows but double clicking is easier.