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: In current webbbs/TetraBB/HTML/Admin.pl

..... modify any of the core scripts.

Starting modifications of core scripts always is a dead-end road because sooner or later it makes updates/upgrades to future versions almost impossible.
Instead use what's designed to be used for customisation.

E.g.: The admin portal page is built on a FULL template. So edit the template, which is somewhere in the template folder:
/_tmpl/xxx/admin/pro_admin_portal.html

Don't know if "xxx" is "default" or "admin" (or both) on your site. Check it out yourself.

But NEVER edit any of the core scripts unless you know exactly what the drawback is and accept it for the future.
There is almost always a better way the editing core scripts. This is no old horse any more, it offers lots of options for customisation.

my 2 cts.

Rainer