$username = "username"
$password = "password"

#Initialize IE
$ie = New-Object -com InternetExplorer.Application
$ie.visible=$true

#Navigate to website
$ie.navigate("https://website")
while($ie.ReadyState -ne 4) {start-sleep -m 100}

#Input login
($Ie.Document.getElementsByName("username") | where { $_.Name -eq "username" }).value = "$username"
($Ie.Document.getElementsByName("password") | where { $_.Name -eq "password" }).value = "$password"
start-sleep -m 100
$ie.document.getElementById("login_submit").click()