When you are in TV Guide, along the top, it shows days of the week. TODAY should have a square around it.
Look at the bottom of the screen with the little circles.
It should read left to right:
Info, on now (green) edit channels (yellow) categories (blue) then CHANGE DAY, with the symbols for the forward/rewind buttons.
Press either direction for as many days as you want to change.
So if you want to go to next Monday, it’s 3 presses with the right hand ( forward) button and if you want to go back to last Sunday, it’s 5 presses with the left hand (rewind) button.
Once you have highlighted the day you want, use the button that looks like 3 dots forming a triangle (directly under OK).
This will let you scroll through the TV guide in the usual way, for your chosen day.
Remember that you can only go forward or back up to a max of 7 days.