Your personal history will initially be empty, but browse as you normally would and everything you visit or read online will be added (as long as your web extension is installed and is orange like this:
, if the extension is grey like this: 
, you need to sign-in).
Neeah never forgets a webpage you visit (unless you remove select history items or remove all history, “Blacklist or Exclude” websites, pause Neeah, or browse "incognito").