This Article is more like proceeding from the last article Creating a storage account.
Before you can generate a SAS URI, a Storage account must have been created and a blob file be uploaded .
Select the blob file created.
the image above will be displayed. Go ahead and click the generate SAS as shown above.
Set the properties listed above to restrict full access .
the range displayed the time frame to which you wish to grant access to your blob. After which access will be denied.