Adding container registries in the Snyk UI is extremely easy. Please follow these instructions to add the Docker Hub registry to your Snyk account.
Use the Add project button and select Docker Hub integration to import your container image.
The Snyk UI will show you all the repositories and images in your Docker Hub environment. Select the images you want to import. After you select images, the Snyk UI will process your request and asks you to refresh your screen to see the details. You can also view the import log from the project UI.