cls

configuration UserConfig{
    param(
        [System.Management.Automation.PSCredential]$DomainCredential
    )

    Import-DscResource -ModuleName PSDesiredStateConfiguration    

    node $AllNodes.NodeName{

        Group Admin{
            GroupName = 'Administrators'
            Ensure = 'Present'
            #PsDscRunAsCredential = $mycreds
            Credential = $DomainCredential
            Members = @('domainname\username')
        }

    }
}

$configData = @{
    AllNodes = @(
        @{
            NodeName = 'SEAPR1DBBAT046'
            PSDscAllowPlainTextPassword = $true
            PSDscAllowDomainUser = $true
        }
    )
}

$cred = Get-Credential -UserName domain\user -Message "Password please"
UserConfig -DomainCredential $cred -ConfigurationData $configData