Accidentally Changed WordPress address (URL)

So I was trying to fix a bug with my site and thought (stupidly) “Hey, there’s an inconsistency that may be causing the problem!” So I changed my WordPress address (URL) in settings>general to my site’s homepage instead of the install directory (which was a subpage entitled “site1”). Looking back, this was a horribly idiotic move. But I am in the situation now.

Who can help get me out of it? I challenge you! ??

I’ve popped around in ftp trying to figure out where the setting is to change it. But frankly, I’m too new at this to even know how I would change it once I found the location of that setting.

Thanks in advance!!