What template did you edit gb2world?
/modules/Fast_Lane_Checkout/checkout_2_method.tpl
Code:
{* {include file="customer/buttons/modify.tpl" href="register.php?mode=update&action=cart" style="link"} *}
{include file="customer/buttons/modify.tpl" href="cart.php?mode=checkout&edit_profile" style="link"}
Thanks for posting.