Change Azure VM Instance Size Powershell

1) download and install Azure Powershell

https://www.windowsazure.com/en-us/downloads/?fb=en-us

2) Export your window azure profile and rename to something you like ex: 'c:\myazureprofile.publishsettings'

https://windows.azure.com/download/publishprofile.aspx

3) Import the setting

Import-AzurePublishSettingsFile 'c:\myazureprofile.publishsettings'

4) Run command in powershell to get current VM you have in asure, this will give you ServiceName, Name and Status 

Get-AzureVM

5) Change VM Size, $cloudSvcName, $vmname are from step 4. $NewSize value = ExtraSmall, Small, Medium...

Get-AzureVM -ServiceName $cloudSvcName -Name $vmname | Set-AzureVMSize $NewSize | Update-AzureVM