Newbie tip: Always try to search for your question before posting. In a few minutes with the search box (seeking "web page", "webpage" and "URL form") I found the following:

• RE: Loading A Site Into An Array
• Grabbing a Web Page
• How can my script retrieve the contents of an existing webpage?
• Getting a webpage through proxy
• How do post to a URL from a form and display the results in a browser?
• How do I automate an HTML form submission? (Note this one is in perlfaq9. You should always check perlfaq even before PerlMonks)

Search is your friend. Learn from the wisdom of Monks past.