2 accounts, how do I delete one?

So I ended up making two accounts because I couldn't remember the name on my other account when I had been gone for a year. I always use different user names all over the internet.
Anyways, one of my old threads was still alive after all that time so I finally found my old account afterwards and managed to remember my password!
I'm not sure if that is against the rules or not, and I really don't have use for 2 accounts, and I can't seem to find anywhere that I can delete my first account under the user cp settings?

My old account was under the name Ciqala. Obviously my new one is Thunderseed. But I can't figure out where the settings are to delete my old account. Not very technically inclined!

I am the same person though, and I don't want to confuse anyone.

Thanks,
Sabrina.

Thunderseed you need to message the mods.

Where do I find them at?