How do I delete a Reddit profile?

A couple of weeks ago, I somehow created a new profile under this, my main account profile. I wasn’t trying to post undercover somewhere and I honestly have no idea how it happened. When I realized it at the time, I thought I deleted it and I moved on. Since then, every once in awhile, my account switches to that profile, which I only notice when none of my usual subs show up on my feed.

How can I delete that other profile?