Hi,
Please go to the exercise page, Activate sandbox, review permissions and click accept if prompted. Next open a new tab with the Azure portal (after Sandbox is finished activating) using link below:
https://portal.azure.com/learn.docs.microsoft.com
Please follow screenshots below to arrive at the Basics tab of the Create storage account blade:
STEP #2 - Create a resource
STEP #3 - Storage
STEP #4 - Storage account Create
STEP #5 - Create a storage account Basics tab
If you still have trouble finding it you may click the link below after activating sandbox and opening portal:
https://portal.azure.com/#create/Microsoft.StorageAccount-ARM
If the above was helpful please click Accept Answer.
Thanks.
-TP