B.N!
Please check the online => area of validity map
In the box in the top left corner of the map, make sure the correct option (“GA … saver day pass … with valid half fare travelcard”) is selected, also check the legend behind the “i” symbol.
Then zoom in using the + symbol or the slider into the Jungfrau area (almost to the max. zoom level in order to see all relevant details):
All solid lines mean free travel with the saver day pass, so the saver day pass itself already IS your ticket.
You’ll need to additionally buy separate tickets (with selected half fare discount option in the personal details) ONLY for those mountain trips marked with a dotted line.