How to create autodetect changing of a website and take the offer

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C++/CLI

VB

SQL

SQL-Server

PHP

Hi,

I already 6 years didn't follow any update of software things.
Kindly need a help to let me know what kind of software that can help create this application.

1. Auto refresh around 5 seconds
Option 1 : If auto pops-out menu appear will directly click the "add" button of the pops-out
Option 2 : can we detect any changing of 1 specific line and column of a website if we
don't have the script of the website, basic on some characters or number only.
if can then if detected any changing of that line or column then click the "add"
button.
(this two condition will stop the auto refresh function)

2. After that will pop up a form, fill the "empty entry" with number. Let's say "20"
Then click the "Ok/get offers" button

3. Then another form appear then detect the first line word and put it as Variable x, click OK Button

4. Then auto refill a form according to the variable x.

The algorithm that I can imagine is around like this :

Auto refresh 5'
If Detect Pops-Out or FP-Fund not 0
Then Stop Auto refresh
click "add" button
//another form will appear

Fill Input Text/number with "20"
Detect Payment Method = Paypal, neteller, payza, alert pay, wire transfer, solid trust pay maybank, mandiri, BCA, CIMB, Upay
Variable x = Payment method
Click "Get Offer" Button

// Another form appear
If x = Paypal,neteller,alertpay,payza
Then fill input email : xxxxx@xxxxx.com
Click "OK" Button

Else if x = wire transfer
Then fill input1 "abc";
input 2 "123"
input 3 "asd"
CLick "OK" Button

Else if

Else If

Else back to script "auto refresh 5'"

All I can is around like.

This can be said like software to detect any offer from website and do the transaction.

anyone can suggest what software that I can use to implement it?
Can share the right script??

Thank You