How to connect destination store with source store?

Require:

• Applies to 2 or more stores. 
• You need to install the app in all stores.

Case 1 : Current store is Destination store:

• Add the source store domain (format: my_store.myshopify.com) OR source store unique code (format: xxxx-xxxx-xxxx-xxxx) to the “Enter source store unique code or domain” section of the home page in the IMPORT section.
• The source store will be listed immediately in Source Stores page upon successful authentication.

Case 2 : Current store is Source store:

• Add the destination store domain (format: my_store.myshopify.com) OR destination store unique code (format: xxxx-xxxx-xxxx-xxxx) to the “Enter destination store unique code or domain” section of the home page in the DUPLICATE STORE section.
• The destination store will be listed immediately in Destination Stores page upon successful authentication.