Hi I need some help creating an ongoing HTML form. I have my code:

<form action="" method="post" autocomplete="on">

<label class="bold" for="u" id="username">UserName:</label>
<span><input class="txtin" type="text" name="u" id="u" value=""/></span>

<label class="bold" for="c" id="activation">Activation Code:</label>
<span><input class="txtin" type="text" name="c" id="c" value=""/></span>

<input type="hidden" name="step" value="1" />
<input type="submit" tabindex="6" class="continue" />
</form>

So when you click the submit the page will look different but the URL will stay the same. Please can you help me.

The code for when the page changes:

<p>Your account has been activated.</p>

Cap123