Category "verification"

Laravel - 403 invalid signature on email verification

I have enabled Email verification on my laravel site. If they dont do it immediatly, but after a day or two, the link times out.. and they land on a page with

SSH Remote Host Identification Has Changed Error and Unable To Modify SSH Keys

I have a MacBook and by mistake I tried to setup password less ssh access for GitHub and definitely messed things up. I am new to Macs and I have no idea how to