If you want to know subscriptions associated with your account, just use Get-AzureSubscription cmdlet on a PowerShell prompt. It should show details like below:

Alternatively, if you are using resource manager, you can use Get-AzureRmSubscription cmdlet:

To change subscription account for your current session, use Set-AzureSubscription cmdlet:

Set-AzureSubscription -SubscriptionName MetavrseEngineering