Sorry. Should have given more details.
It's a refurbished Wahoo Kickr Core from Wahoo.
I did buy a separate cassette from Wahoo.
I'm not sure I got all of the paperwork with the refurbished model, so I'm going off of what I got. I understand there is something to line up when getting the cassette installed.
Does it matter how many gears are on my bike normally vs how many are on the new cassette? I think the new cassette might have more.
(Figuring how to get my bike taken apart enough will be the next step.
)