How do I sign in?

Please help me!

Ok, blogger friends, I need your help! I haven't been able to sign in to blogger since google bought it out! I have to go to Jessica's blog (which is private) and sign in so I can view her blog and then go to my dashboard from there. I can't just go to blogger and sign in. It keeps wanting me to make a google account to sign in. The problem is I already have a google account (That's my e-mail now.) and when I use that to sign in it gives me a whole new blog! Is there a way to either transfer my blog or sign in and still keep this blog?

Thanks for your help!