Visit the Pools tab and select "Add pool":
Give the pool and the site a unique name and enter the URL to the Sync Core that we have provided to you.
If you're connecting the same site to multiple pools or if you re-use the same Sync Core for multiple sites, make sure to make the pool unique for each use-case. Otherwise, you can just call it "Content". If you're connecting the same site to multiple pools, re-use the site identifier if possible. If you're using the same Sync Core for multiple sites, make sure each connected site has a unique name. Otherwise, you can just call it "Stage".
After hitting Save, you will be redirected to the export page for the pool. Wait until it has finished before you continue:
You will see a success message once it's finished:
If you see any errors here, you probably entered an incorrect Sync Core URL. In that case re-enter the correct URL and wait for the export to finish.