@arianator3942
Are you trying to change their features (face or body structure etc) or just their wardrobe?
With your Sim already in game you can take them to a mirror or dresser and select "change sim".
The entire household will then appear in CAS without a cheat.
You can change everything except facial features and relationships to others in that household.
You mentioned using a laptop so I would guess you are on either PC or Mac.
Do you have any mods or cc in your game?
I can confirm the cheat to "modify in CAS" does work with testingcheats on because I just did it in my game.
