1) Backup /signup.php and /class2.php

2) Rename /signup.php to /usersup.php (anything, but not signup.php or customsignup.php)

3 Open /usersup.php for editing and do the following

3) line 622

	change header("Location: ".e_BASE."signup.php?resend");
	
	to header("Location: ".e_BASE."usersup.php?resend");

4) Line 915

	change header('Location: '.e_BASE.'signup.php');
	to header('Location: '.e_BASE.'usersup.php');
	
5) Line 982

	change 	define("RETURNADDRESS", (substr(SITEURL, -1) == "/" ? SITEURL."signup.php?activate.".$nid.".".$u_key : SITEURL."/signup.php?activate.".$nid.".".$u_key.".".e_LAN));
	to 	define("RETURNADDRESS", (substr(SITEURL, -1) == "/" ? SITEURL."usersup.php?activate.".$nid.".".$u_key : SITEURL."/usersup.php?activate.".$nid.".".$u_key.".".e_LAN));
	** note 2 counts of signup.php links
	
6) Open /class2.php for editing
	Line 778
	
	change define("e_SIGNUP", e_BASE.(file_exists(e_BASE."customsignup.php") ? "customsignup.php" : "signup.php"));
	to
	define("e_SIGNUP", e_BASE.(file_exists(e_BASE."customsignup.php") ? "customsignup.php" : "usersup.php"));
	
6) save files and upload to server

7) remove signup.php from server

8) Check plugins for signup.php links. Just download the folder and search for the text 'signup.php'