You can purchase the Collectable House from the Store -> Building Tab. Once you have the collectable House on your farm, you can simply tap the ‘+’ to add your Collectable Items that are located on your farm. 
Tap 
to put the Collectable Items back on your farm.Tap 
to change where Collectable Items are placed inside of the Collectable House. Please note that time limited Collectable Items cannot be placed in the Collectable House.Note: You can collect all items ready to be collected by tapping the basket in the upper right corner. The Collectable House currently offers 72 Spots divided into 6 Rooms for your Collectable Items.
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Family Barn Game GUIDE