Azure Storage - Delete all old files

I need to cleanup all old backup files from Azure Storage. I will need you to show me how it can be done via GUI Azure Storage Explorer and Give me the Script azcopy and powershell script to delete old files based on the date. If you have done this it should not take more than 15 mins but if you want to give it a try I am ok to work with you. I will TeamViewer you my laptop and we will be working together for that hour.
Just fyi; I am planning to give these small tasks, just to vet SQL and Azure SQL DBAs for more tasks in future.