OK, long story.. Somehow we got errors on my boss's blog after changing settings, and so I thought I'd just upload the old backup blog file folder over the one with the errors.. but I didn't know what I was doing (obviously) and now we can't even see a log in page or the place to do new blog entries..
I can still see the blog entries on my Google blog reader, so I know they aren't totally gone, but I dare not do any other changes until I know how to fix what's broken, just in case we lose anything else. I also saved a cached page that was cached before the "fatal error" appeared on the blog site.

Keep in mind I didn't build the blog to begin with, and so you'll need to talk to me like you were talking to a half-wit, which is what I feel like since I did this. I know it was stupid.. but what's done is done, and now I need to fix it.

I don't know what version the b2evolution software is, and I have downloaded the most recent version but I don't want to upload anything until I am sure it won't wipe out anything else.
The website is www.cotebrothers.com/blogs/index
Thanks for any help you can give me.