PowerShell Metadata Navigational Menu of Simple Links from excel file in sharepoint 2013

Can any one tell me how to update the url for a group of terms from excel through powershell script in sharepoint 2013.

Please find the screen shot for the same

Thanks, Sandy

As suggested Below by Amal Hashim

$siteCollectionUrl = "http://sp2013:90"
$site =new-object Microsoft.SharePoint.SPSite($siteCollectionUrl)
$session = New-Object Microsoft.SharePoint.Taxonomy.TaxonomySession($site)
$termStore = $session.TermStores[0]
$group = $termStore.Groups["Corporate Taxonomy"]
$termSet = $group.TermSets["Geography"]
$terms = $termSet.GetAllTerms()
foreach ($term in $terms)
{
    if ($term.Name -eq "Durban")
    {
        Write-Host "Drban Found!"
        $term.SetLocalCustomProperty("_Sys_Nav_SimpleLinkUrl", "URL")

    }

$termSet.CommitAll()

}