Log in to the old portal and go to Virtual Machines and then the Images tab. The URL will be https://manage.windowsazure.com/@yourname.onmicrosoft.com#Workspaces/VirtualMachineExtension/images. Select an image and select Delete at the bottom.

After that, go to your repository and delete it.
You can also try the following, which will remove the blob for this container and then delete the container.
Add-AzureAccount Get-AzureSubscription | Format-Table SubscriptionName, IsDefault, IsCurrent, CurrentStorageAccountName $SubscriptionName = 'Your subsscription name' Select-AzureSubscription -SubscriptionName $SubscriptionName Get-AzureSubscription -Default Get-AzureStorageAccount | Format-Table -Property StorageAccountName, Location, AccountType, StorageAccountStatus $StorageAccountName = "Your storage account" $StorageAccountKey = (Get-AzureStorageKey -StorageAccountName $StorageAccountName).Primary $ContainerName = "Your container name" $Context = New-AzureStorageContext -StorageAccountName $StorageAccountName -StorageAccountKey $StorageAccountKey
If you want to break the print on blob, you can use How to block the blocked lease of blob storage in Microsoft Azure (PowerShell)
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