How to change function

How to customize:

	if( $active_tab == 'active' ) {
		$bid_status = 'active';
		echo uwa_front_user_bid_list($user_id, "active");
	}
	if( $active_tab == 'won' ) {
		$bid_status = 'won';
		echo uwa_front_user_bid_list($user_id, "won");
	}	
	if( $active_tab == 'lost' ) {
		$bid_status = 'lost';
		echo uwa_front_user_bid_list($user_id, "lost");
	}

uwa_front_user_bid_list -> this function i need to change in my custom theme. please advice.