Powershell IE webpage Automation

Question

Alright so here's my problem i've been trying to automate an IE session, i've got the logging into the website down just trying to input Into a Search field,
change a dropdown selection and click the Go button. I've been trying to use $ie.Document.getElementById("").value
= $variable and multiple variations of getElementByTagName, getElementByName, so on....with no luck, the html code has no id tag so i feel like that is making this more complicated than it needs to be, so below i will post the html code for the input box,
go button so on and some of the code i've been trying to use. Any ideas would be greatly appreciated, thanks!
HTML Code
Selection Drop Down Html Code
<select onchange="SearchProperty_OnChange(this);"
class="SearchFormSelectList" name="SearchProperty"><option value="displayName">User Display name</option><option selected="" value="userPrincipalName">Logon
name</option><option value="samAccountName">Logon name (pre-W2K)</option><option value="$McsFriendlyName">Name</option><option
value="description">Description</option><option
value="$McsFriendlyPath">User Path</option></select>
Search Field html code
<input type="text" class="FormTextInput" name="MatchString" value="" size="20">
Go Button html code
<input class="formButton" type="submit" value="Go">
My CODE
$userurl = "res://ieframe.dll/invalidcert.htm?SSLError=50331648#mywebsite.com"
$ie = New-Object -comobject InternetExplorer.Application
$ie.visible = $true
$ie.silent = $true
$ie.Navigate( $userurl )
while( $ie.busy){Start-Sleep 1}
$secLink = $ie.Document.getElementsByTagName('A')
| Where-Object {$_.innerText -eq 'Continue to this website (not recommended).'}
$secLink.click()
while( $ie.busy){Start-Sleep 1}
##########################ABOVE
CODE WORKS
#Logon code
$iexp = Select-Window iexplore | Set-WindowActive
$iexp | Send-Keys "DOMAIN\$USERNAME{TAB}$p{TAB}{TAB}{ENTER}"
#Another issue i have is with the logon code it attempts to enter the password twice for some reason...but this results in #opening a new IE windows and it trys to
search the password...not sure what is happening there...
#Here is my main issue...i've tried multiple variations of this code with no success....none of these work
$ie.Document.getElementByTagName("MatchString").value
= $usersearch
$ie.Document.getElementById("MatchString").value
= $usersearch
$ie.Document.getElementById("input.formtextinput").value
= $usersearch
$ie.Document.getElementById("formtextinput").value
= $usersearch
$ie.Document.getElementByTagName("SearchProperty").value
= "Logon name"
$Go = $ie.Document.getElementsByValue('Go')#
| where {$_.innerText -eq 'Go'}
$Go.click()

Answer 1

How can WASP compensate for a lack of IDs.
You have to realize that web pages are not designed for automation and that the browser is designed t obfuscate attempts to hack a page.  WHat you can get awaya with is limited and usually requires extreme patience to work out the variations in page
delivery.
You can use The WebRequest class to "GET" a page and use it to post back a "SUBMIT" once you understand what the page is requiring inn the postback. 
The biggest first issue is how to extract information from a context.  You can use Regex as long as the context is relatively stable and unique.  This is where the patience come in.  You need to insect the context an find a pattern that identifies
it uniquely.  If its only unigueness is <td>item</td> then you are lost.
You can also use GetElementByTagName ... to narrow the scopy if you can find a way to identify which table or td the item is in.
Good luck.
¯\_(ツ)_/¯