A direct message on Twitter is probably a good start if you need a quick answer to a simple question.
Invite yourself to the Tackorama Discord server and ask me something there.
Tackorama is based in London, UK. It is a registered limited company (no 09259894) and the registered address is:
71–75 Shelton Street
But I wouldn't use snail mail if I was you because that address is for official business (and has to be displayed, says UK law, even though it's not Tackorama's actual location).