@MxD,

From the home screen on your Kasa Application, tap on the name of your home in the top left, and in the dropdown that appears Home Settings. You should now see a list of the homes that you have created. Navigate into the home that you would like to move a device to, and then navigate into the room where the device is located.

You should then be presented with an option to Add Devices to that Room. You will be given the option of adding any of the devices on your account to that home.

Tip: If you ever need a device in more than one home, you can create a device group with only that device, and add the group to the other home.