To locate your UPC and ISRC codes, navigate to Distribute ► Releases ► Submitted Releases. From here, you can either search the release title or scroll to the release and click on it.
On the Release Details tab, you'll find the UPC for your release.
To find the ISRC codes, select the Song Details. Within the track details, you'll see the ISRC codes listed for each track.
If you're looking for a full list of your catalog metadata (UPCs, ISRCs, Release titles, Track titles, etc.), you can export your catalog inventory by selecting Export Inventory under Distribute ► Releases.