First, find the Person you want to Unarchive.
Click Here for more Information on how to find a Person you Archived.

On the Archived Person's Page.
Click on the Gear Icon in the Information Section on the left side of the page.
A menu will open.
Click on the Unarchive Person item.
A window will open.
Click on the UNARCHIVE button near the bottom right corner. 

Now this Person will be treated like a normal Person in your Farm.

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