I have Membership and BuddyPress installed. I need to place

I have Membership and BuddyPress installed.

I need to place a subscription form in the front page and use it as the main signup form. I would also like to know how I can add a custom field to the form so the user specifies his website url and select radio button to select whether free subscription or one of the paying ones.

I looked at the code of a form generated when clicking at one of the subscription buttons and copied it but it didn't work. When I fill it out and submit, nothing happens, same page comes back and not member entry is created.

Can you help?

Thanks
- Joe

Here's the code I used:

<form action="" name="signup_form" id="signup_form" class="standard-form" method="post" enctype="multipart/form-data">
<input type="hidden" value="10" name="subscription">
<h2>Sign Up to Join Free</h2>
<p>Registering for this site is easy, just fill in the fields below to get a new account set up for you in no time.</p>
<div id="basic-details-section" class="register-section">
<h4>Account Details</h4>
<label for="signup_username">Username (required)</label>
<input id="signup_username" value="" name="signup_username" type="text" />
<label for="signup_email">Email Address (required)</label>
<input type="text" value="" id="signup_email" name="signup_email"></br>
<label for="signup_password">Choose a Password (required)</label>
<input type="password" value="" id="signup_password" name="signup_password"></br>
<label for="signup_password_confirm">Confirm Password (required)</label>
<input type="password" value="" id="signup_password_confirm" name="signup_password_confirm"></br>
</div><!-- #basic-details-section -->
<div id="profile-details-section" class="register-section">
<h4>Profile Details</h4>
<div class="editfield">
<label for="field_1">Name (required)</label>
<input type="text" value="" id="field_1" name="field_1">
<p class="description"></p>
</div>
<input type="hidden" value="1" id="signup_profile_field_ids" name="signup_profile_field_ids">
</div><!-- #profile-details-section -->
<div class="submit">
<input type="submit" name="signup_submit" id="signup_submit" value="Sign Up">
</div>
<input type="hidden" value="72db0bd0d7" name="_wpnonce" id="_wpnonce">
<input type="hidden" value="/sign-up/?action=registeruser&subscription=10" name="_wp_http_referer">
<input type="hidden" value="validatepage1bp" name="action">
</form>