Get web elements with VBA from child tab with IE for an email list manager automation changes

I am fully automating changes for several members of mail groups in an internal company site called groupkeeper.mycompany.com (a tool for creating mail distribution lists, high security features BTW).

I managed to go to the admin url, choose checkbox either for adding or removing a member from a certain group and even to check the checkbox of the group which member belongs, all with no issue, pretty much everything related to find and click elements goes smoothly so far, the problem is:

My code begins in URL http://groupkeeper.mycompany.com/grpkeeper/grp.php and it is able to:

 Check a checkbox
 Click button of action (remove)

right after that a new tab opens with url:

http://groupkeeper.mycompany.com/grpkeeper/grpmemd.php

Tab Title is exactly the same: "GroupKeeper", for every tab and nothing else

from there seems to be IE object remains on previous url and I can't get elements of this newly opened url for further automation.

If I try navigating to http://groupkeeper.mycompany.com/grpkeeper/grpmemd.php, a textarea which I need to fill with information goes gray out with message: "Nothing to change" and only Cancel button enabled.

How can I reach elements of this new site? I tried everything with no good outcomes whatsoever.

Tried a second object and no result (couldn't tell if I did it correctly),

Help pretty please.

Thank you!

Tried an alternate IE obj and did not work.