https://www.icyphoenix.com/viewtopic.php?f=35&t=7697&p=51925#p51925
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spydie
Sun 06 Mar, 2011 21:00

Re: Admins Equal Rights?
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Open [b] includes/constants.php[/b]

find
[code linenumbers=false]// Insert here the IDs of the main admins separated by commas, they will be able to access special features in ACP
// Allowed features: Action Logs, Private Messages, DB Tools, Templates Edit (XS Style)
// If the constant is deleted then every admin is able to access the Full ACP
define('MAIN_ADMINS_ID', '2');
[/code]

add the user ID of your other admin or comment the define, so all Admins have full access to ACP

example 1

define('MAIN_ADMINS_ID', '2,[color=#ff000c] 54[/color]');

example 2 

// define('MAIN_ADMINS_ID', '2');


