Hi Timmo and welcome.
You should be able to see the rings of Saturn in your six inch and with both the eyepieces provided.
I can see the rings in my 80mm scope with a 12mm eyepiece,small but definitely see rings.
Two possible problems,one is collimation and the other is focus.
If the moon is crisp and features sharp then Saturn should be also
Don't forget Saturn won't be very big in either eyepiece so the focus will have to be spot on to get the rings sharp.
Did your scope come with a barlow lens?
If so put that in and try the 20mm eyepiece first then swap to the 10mm
Cheers
