Well, I made a big mistake, as a result of which I can no longer log in. When I left off my attempts to set up a WordPress.org website at arwenspicer.com, I had reached the stage of having a page that says "Your website is ready." (I'm using Laughing Squid as a host.)
However, I could not find out how to get this placeholder page to connect to my WordPress dashboard. With my zero computing skills, I was attempting to figure out how to do this and changed the URLs in my settings to "http://www.arwenspicer.com". I was pretty sure this wouldn't work, but I thought it wouldn't hurt to try. It did.
Now, I can no longer log on to arwenspicer.com/wp-admin/. I get a message that says the URL is not found on this server. Since I can't log on, and I can't go back and change the URLs I apparently messed up.
What should I do to get login access again? (This is my only question; I'll save the actual website problem for another day.) Thanks.