Yes ive have been a member here for a while but that doesnt mean its been me doing the sites updates and mods , it wasnt !!!! but im tring now as i no longer have my parnter to help with this .

Now I have no ideal what this is meaning , search Hook admin_options_processing with title VDB - usergroup options saving

I also dont undertand how to find this in the code replace the content with

PHP Code:
if ($oldsetting['varname'] == bbactive_groups)
{
$settings["$oldsetting[varname]"] = implode(',', $vbulletin->GPC['setting']['bbactive_groups']);
}

Did you read the link I posted about plugins? It will explain about how a plugin uses a hook location. So, the mod wants you to find the plugin using a specific hook location and then edit it with the new code.

<font color="DarkOrange">Yes I read that but it doesnt show or say anything that I saw that shows how to add or change the code . Or im I missing it ?

Hester57</font>

When in the Plugins & Products > Plugin Manager, you will see the list of plugins. They should be grouped by product/modification. In that list is also the hook location. So, you can find the plugin you are looking for and then hit Edit next to the name or simply click on the plugin name. Then, you will be taken to a screen with the code for that plugin and you may edit it there and hit Save.