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Regression Automation In Vba

The above is a screenshot of the data analysis (regression) I want to automate with vba code. Like all macros, I tried to record first and only got the following

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You take an input, click a button. This will them create a small HTML table with a text input box and another button.

Sub VisitWebsite()
Dim ie As Object
Dim tcode As String
Dim sURL As String
sURL = http://sample.jsp
ie.navigate sURL
ie.Visible = True
tcode = "apples"

While ie.busy
Application.Wait Now() + TimeValue("00:00:03")

For Each ieForm In ie.document.forms
ieForm(1).Value = tcode
Set ieForm = Nothing
Exit For
The code ieForm(1).Value = tcode works. The code ieForm.submit also hits submit on the button.

The problem is I cannnot figure out how to access the 2nd button which is generated when you click the 1st button. I have tried every variation of ieForm(1).Value. There appears to be only 3 forms (0, 1, 2). When I try 3 or greater, I get an error.

When I use ieForm(2).Value = "something", the Retrieve button text actually changes name to "something".

I've attached a screen shot of the webpage. I can insert text into the top Track Code box, and click Retrieve.

I can't change the text in the Routing Position field, and I cannot click the "Set" button. Any help would be greatly appreciated. I am still a beginner with VBA and it took me a while just to get it to work with the 1st input box.

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the macro runs with no errors, but it doesn't "solve." the parameter cells retain their original values.

i should mention that my macro ran perfectly before i consolidated the 4 separate solver calls into one loop. I got tired of having to type 4 different constraint changes in the code as i was optimizing the solver.

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Sub Macrosolver()

Dim iteration As Long
Dim i As Integer
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below is my initial code -

Sub ListLinks()
Dim IeApp As InternetExplorer
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'Create new instance of IE
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[Attached is a spreadsheet with the actual dataset]

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