Plug-in locked me out of sight, unable to open even the login window

Hello!
I am completely lost. I have been working away on a new blog that I was supposed to release today with a Big New Blog post… YAY… not. Because while I was working on my blog yesterday I used a plug-in provided by Taragana to temporarily put an under construction sign when people went to my blog. And then today when I was going to go live I went to open my blog and nothing but the bloody message. Any link I use to simply try and access login-in screen just brings up that message. I am totally clueless as to how to get back in my blog to take that thing down. I worked on it all day yesterday with the plug-in activated. I shut down my computer at night. My address is kmeyerphotography.com/blog. I really, really need to get it up and running again. Any help would be greatly appreciated. Sigh, me and computers have a rough relationship sometimes,
Frustrated,
Karmen