The property 'value' cannot be found on this object. Verify that the property exists and can be set.
At C:Test.ps1:17 char:1
+ $usernamefield.value = $username
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : InvalidOperation: (:) [], RuntimeException
    + FullyQualifiedErrorId : PropertyAssignmentException

The property 'value' cannot be found on this object. Verify that the property exists and can be set.
At C:Test.ps1:20 char:1
+ $passwordfield.value = $password
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : InvalidOperation: (:) [], RuntimeException
    + FullyQualifiedErrorId : PropertyAssignmentException

Method invocation failed because [System.DBNull] does not contain a method named 'click'.
At C:Test.ps1:23 char:1
+ $Link.click()
+ ~~~~~~~~~~~~~
    + CategoryInfo          : InvalidOperation: (:) [], RuntimeException
    + FullyQualifiedErrorId : MethodNotFound`

$ie = New-Object -ComObject 'internetExplorer.Application'
$ie.Visible= $true # Make it visible

$usernmae="test"

$password="test1"

$ie.Navigate("https://website.com/login")

While ($ie.Busy -eq $true) {Start-Sleep -Seconds 3;}

$usernamefield = $ie.document.getElementByID('ysi_email')
$usernamefield.value = $username

$passwordfield = $ie.document.getElementByID('ysi_password')
$passwordfield.value = $password

$Link = $ie.document.getElementByID('ysi_btn_login')
$Link.click()

$ie = New-Object -ComObject 'internetExplorer.Application'
$ie.Visible= $true # Make it visible

$username="test@toto.fr"

$password="test1"

$ie.Navigate("https://To your detailled URL")

While ($ie.Busy -eq $true) {Start-Sleep -Seconds 3;}

$usernamefield = $ie.document.getElementByID('ysi_email')
$usernamefield.value = "$username"

$passwordfield = $ie.document.getElementByID('ysi_password')
$passwordfield.value = "$password"

$Link = $ie.document.getElementByID('ysi_btn_login')
$Link.click()

$ie.Quit()

#Load Selenium to download all URL xml sites
Add-Type -Path "C:TempWebDriver.dll" # Load the Selenium .Net library
$env:PATH += ";C:TempUMF_Scraping" # Load the IEDriverServer.exe
$ie_object = New-Object "OpenQA.Selenium.IE.InternetExplorerDriver" # Instantiate Internet Explorer

# Using Element ID for this example, but I prefer using The Name element.
$ie_object.Navigate().GoToURL( "https://website.com/login") # Navigate to login page URL
$InputUser = $ie_object.FindElementById("ysi_email") # Find the ID element for username input textbox, gt this from the DOM developer Tools search
$InputUser.SendKeys("usernamegoeshere") # Push the text
$PasswordUser = $ie_object.FindElementById("ysi_password") # Find the ID element for password input textbox, get this from the DOM developer Tools search
$PasswordUser.SendKeys("passwordgoeshere") # Push the text
$LoginButton = $ie_object.FindElementById("ysi_btn_login") # Find the ID element for the submit button, get this from the DOM developer Tools search
$LoginButton.Click() #Sent click to the submit button