Sharepoint add new managed account via power shell

Hi,

What you need to do is:
Type:

$cred = Get-Credential

Enter your credits on logon screen.

Create account cmd:
New-SPManagedAccount –Credential $cred

Check account if created:
Get-SPManagedAccount


Source:
http://www.petestilgoe.com/2011/01/sharepoint-2010-adding-a-new-managed-account-from-different-domain-errors-with-access-denied/