To save the household to your library click on the folder icon in the bottom right corner of the window. To add a household to the gallery from Create a Sim click on the “save household” icon in the top right navigation bar, choose a thumbnail by clicking on the photo icon until one you like appears, then add a description, once completed click the cloud in the bottom left under the description section to upload to the gallery.
The Gallery is a place for you to browse, share, and download additional content created by members of the community without having to leave your game.
