Hello Ckigheashoi22
Yes, you are missing the convenient fact that the Saver Day Pass is valid for the entire public transport network on the day of validity. Thus, there is no need to enter start / end destinations when purchasing the SDP.
You are welcome to hop on / off public transport services at will, no matter where. Our trains are considered mass transit; you simply get on board a train and find a free seat - that easy.
Let us know if you need more help, we gladly assist you.
Kind regards,
Roland