Blog overkill!!

After a few attempts to start a Blog and some encouragement from my old friend Jane I have managed to get this one going. However, I have a big problem: I actually started 3 Blogs as I didn't know what I was doing...all having the same name....Sylvia @ the lighthouse. This is the only one with any postings on it but if someone gets either of the other two as they search for my blog they will find nothing. I would like some advice from anyone who knows....How do I just delete the other two blogs...you know, shut them down, eradicate them, AGHHH!!! I have spent hours trying to do this. I did manage to delete any postings on the other two blogs but I just want them to disappear entirely!!!. HELP!!