There are few ways by which you could created Shared Access Signature (SAS) for Azure Storage Blob or Container. This one is probably the easiest.
1. Download and install Azure Storage Explorer from http://azurestorageexplorer.codeplex.com/
2. Then add the storage account name and key
3. Then select a container or Blob and select “Security”
4. Then click on the “Shared Access Signatures” tab and choose appropriate options like dates, actions etc click on “Generate Signature”. This will create and URL with SAS to be used as appropriate.