BuddyPress.org

To check if a field has been filled in you can use this function.

function sv_check_tos()

{

global $bp;

if ( empty( $_POST['name_of_field_in_template'] ) )

$bp->signup->errors['name_of_field_in_template'] = __( 'Your error message', 'sv' );

}

add_action( 'bp_signup_validate', 'sv_check_tos' );

Useful for things like agreeing to TOS. Put the function in your functions.php or bp-custom.php file