There are 2 ways to renovate a house!

1. Through the checklist 
-Tap on the checklist icon in the bottom left corner after you buy a house
-Tap on any task in the checklist (this takes you to the room directly and the renovation menu opens up)
-Tap on the renovation/staging item you want and choose a color
-Tap “CONFIRM”

2. Manually 
-Tap and hold the exterior of your 3D house to enter it
-Tap and hold an individual room to enter it
-Tap on whichever item you want to renovate/stage (the renovation menu opens up)
-Tap on the renovation/staging item you want and choose a color
-Tap “CONFIRM”