Help Needed: Adding Email Input Box to Subscribe Page Layout

Hi guys, looking for some help around setting up my subscribe page. I've looked at this kb article: https://www.beehiiv.com/support/article/15092160202263 But the problem is that when I'm in the Layout section, there are 4 content blocks on left hand side and the most obvious one - email input box - is not there. And I can't find a way to add it. So, it's a subscribe page without a way to subscribe 😄