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    I've solved it. Now the editor will first check if you are a XOOPS admin, if yes it will let you manage images and upload.
Here's the solution:
Open class/xoopseditor/ckeditor/ckfinder/config.php
around line line 32 find:
 return false;  
replace with:
 include_once "../../../../../../../mainfile.php"; 
    $isadmin = ($xoopsUser && $xoopsUser->isAdmin()) ? 1 : 0;  
if ($isadmin===1) { 
return true; 
} else { 
return false; 
}  
So the entire function should look like this:
 function CheckAuthentication() 
{ 
    //WARNING : DO NOT simply return "true". By doing so, you are allowing 
    //"anyone" to upload and list the files in your server. You must implement 
    //some kind of session validation here. Even something very simple as... 
 
    // return isset($_SESSION['IsAuthorized']) && $_SESSION['IsAuthorized']; 
 
    //... where $_SESSION['IsAuthorized'] is set to "true" as soon as the 
    //user logs in your system. 
     
    include_once "../../../../../../../mainfile.php"; 
    $isadmin = ($xoopsUser && $xoopsUser->isAdmin()) ? 1 : 0;  
if ($isadmin===1) { 
return true; 
} else { 
return false; 
} 
     
}