Unable to sign in or reset password

I created my account back in February of 2018 and signed into this site using my email address and password. Since I signed in on this computer, I am able to see my old posts; and evidently create new posts.

But, I tried to sign in using a different and couldn’t remember my password. I tried to reset it but the system said it couldn’t find my email address; thought I’m still signed into the site…