If your MSR instance uses image signing, you will need to remove any trust data on the image before you can delete it. For more information, refer to Delete signed images.
To delete an image:
Log in to the MSR web UI.
In the left-side navigation panel, select Repositories.
Click the relevant repository and navigate to the Tags tab.
Select the check box next to the tags that you want to delete.
Alternatively, you can delete every tag for a particular image by deleting the relevant repository.
To delete a repository:
Click the required repository and navigate to the Settings tab.
Scroll down to Delete repository and click Delete.