You are not logged in. However you can subscribe from another Fediverse account, for example Lemmy or Mastodon. To do this, paste the following into the search field of your instance: !email@example.com
Feel free to announce new communities here.
Other than that, this is reserved for admin use only.
I believe you are referring to the following setting in Firefox preferences:
I have this checked and it doesn’t work (i.e. doesn’t open links in new tabs).