Tax number to be added to invoice

-- url of the page with the problem -- : politikchronist.org
-- HikaShop version -- : 4.4.5
-- Joomla version -- : 3.10.3
-- PHP version -- : 7.4.20
-- Browser(s) name and version -- : Firefox 91.0.2 (64Bit)
-- Error-message(debug-mod must be tuned on) -- : How to add our tax number to invoice

Well, I know it should be easy, but cannot find the right way to add our Tax-Number we recently got to the Invoice Print out ... Thanks for any help.

I will do, thanks!