parse url to form?

Not sure I understand the question.  Can you use an example that shows how to email a URL with a link that is recognized by the server?

Also, do you really need a DOCTYPE declaration for Transitional?  I think I might want to get rid of that.  Just a thought.

the link is what i put in question:
http://f1cs97jjm3.ddns.net/profile/join_league.php?[League_owner]=Webroster

i agree about html i just quickly built a page... needed a form

I think what you need is to read the first key in the query string. Please use the Request.QueryString in your page load event as follows:

var n = Request.QueryString;
// See if any query string exists
if (n.HasKeys())
{
    // Get first key and value
    string key = n.GetKey(0);
    string value = n.Get(0);
	//Populate your field or whatever logic you need from values above, for example
	League_owne.Text = key; //assuming League_owne is a server textbox. 
}

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where League_owne is a server textbox defined as:

<asp:TextBox ID="League_owne" runat="server" Height="35" />

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OK, let's take this one step at a time.  First you have to be able to find the URL request variables.

See https://iconoun.com/demo/temp_cs97jjim3.php

See https://iconoun.com/demo/temp_cs97jjim3.php?League_owner=Webroster

The link below does not work, probably because of the square brackets.  They have special meanings in URLs and PHP code, so it's wise to omit them from the request variables unless you know exactly why you're putting them into the request.
https://iconoun.com/demo/temp_cs97jjim3.php?[League_owner]=Webroster

Here is the script that uses the request variables and displays them in the browser viewport.

<?php // demp/temp_cs97jjim3.php
/**
 * https://www.experts-exchange.com/questions/29005124/parse-url-to-form.html
 */
error_reporting(E_ALL);


// FIND THE URL REQUEST VARS
var_dump($_GET);

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wow this is great stuff: great explanation: thank you... from this i can hopefully learn and build once again thanks

Glad things are working and thanks for your kind words!  Here is the request_reflector.php script.  I've found it useful in a lot of situations!

<?php // demo/request_reflector.php
/**
 * Bounce the request vars back
 */
error_reporting(E_ALL);
date_default_timezone_set('America/Chicago');

// START A BUFFER TO CAPTURE THE BROWSER OUTPUT
ob_start();

// USE PREFORMATTING TO MAKE THE OUTPUT EASY TO READ
echo '<pre>';

// SHOW THE COOKIE(S)
echo '$_COOKIE: ';
var_dump($_COOKIE);
echo PHP_EOL;

// SHOW THE GET REQUEST
echo '$_GET: ';
var_dump($_GET);
echo PHP_EOL;

// SHOW WHAT WAS RECEIVED IN POST
echo '$_POST: ';
var_dump($_POST);
echo PHP_EOL;

// SHOW WHAT WAS RECEIVED IN FILES
echo '$_FILES: ';
var_dump($_FILES);
echo PHP_EOL;

// CAPTURE THE BUFFER
$request_data = ob_get_clean();

// SAY THANK YOU
$refer = !empty($_SERVER['HTTP_REFERER']) ? $_SERVER['HTTP_REFERER'] : '(empty referrer)';
echo 'REQUEST REFLECTED FROM ' . $refer . ' AT ' . date('c');
echo PHP_EOL;
echo $request_data;

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