After you've downloaded the export zip (required EDI solution package based on your industry type) file containing the EDI Transactions, you can import the package by using the Import Package option under Solution Promotion feature at the target environment to deploy the solution.
...
Go to Configure > Projects.
Click the More option under the Action column to view the action menu of the EDI Project.
Click Grant Access.
On the Grant Access screen, in the Partner tile, click Grant Access.
On the Confirm dialog box, click Yes, grant it to provide access to the Partner.
...