Azure subscription in Azure Resource manager

If you used to use Azure in classic mode you might get confused about powershell commands in azure resource manager in order to be select your azure subscription  follow these commands

 PS C:\> Get-AzureRmSubscription –SubscriptionName "your subscription" | Select-AzureRmSubscription

normally remember most of classic model commands will follow with rm and end of the verbs.

read more about it 
https://azure.microsoft.com/en-us/documentation/articles/resource-manager-deployment-model/