Custom fields for Shopify User Registration Form

[jmarket]

I can't find any documentation on how to add custom fields for the user registration forum so I tried something but didn't work:\[code\]<div class="single-full-width customer"> <div class="login"> {% form 'create_customer' %} {% if form.errors %} {% for field in form.errors %} <p class="input-error-wrapper"><span>{{field}} {{ form.errors.messages[field] }}</span></p> {% endfor %} {% endif %} <p> <label>First Name:</label> <input type="text" value="" name="customer[first_name]" class="input-text-1" /> </p> <p> <label>Last Name:</label> <input type="text" value="" name="customer[last_name]" class="input-text-1" /> </p> <p> <label>Email Address:</label> <input type="text" value="" name="customer" class="input-text-1" /> </p> <p> <label>Password:</label> <input type="password" value="" name="customer[password]" class="input-text-1" /> </p> <p> <label>Pet Name:</label> <input type="text" value="" name="customer[pet_name]" class="input-text-1" /> <input type="radio" name="customer[pet]" value="http://stackoverflow.com/questions/15461101/cat">Cat <input type="radio" name="customer[pet]" value="http://stackoverflow.com/questions/15461101/dog">Dog </p> <p class="sign-in"> <label></label> <a href="http://stackoverflow.com/questions/15461101/#" class="button-1 custom-font-1 trans-1 form-submit-btn"><span>Register</span></a> <b>or <a href="http://stackoverflow.com/questions/15461101/{{ shop.url }}">Return to store</a></b> </p> {% endform %} </div>\[/code\]The fields I've added are the text input - pet name and the radio boxes for Cat/Dog.I've used a test account but the output was that nothing is saved. I've used {{ customer.pet_name }} to try and get the saved value but got nothing in return.Any suggestions? Thanks!