Ok trying to place a house I saved to My Library, how?

"ta2shop;13565001" wrote:
Hi I have figured it out here r the solution: Menu, Go to Manage Worlds in the Menu, Choose a World (willow creek), Left click on the lot that is empty, Go to the option that says Build, Go to the Gallery, Open it, Click on the house you want to place, Bottom Right icon says Place it, Choose furnished or unfurnished, tada it is done happy simming

Yup, put the house on the lot saved. When I opened the game again the house had gone back to the gallery. There still seems no way to save it and move anybody in. I can move the sim to a vacant lot but can not have both.