Does anyone use Disqus for comments?

Please help!
I am trying to install Disqus for comments and just don't seem to be able to do it.  I have registered for Disqus, verified it etc and then try and follow the installation instructions but can't as my blog doesnt seem to match them.  I am asked to do the below:

1. Find the name of your blog on your dashboard, and click the Template link next to it. If this link says Layout instead, then it's already upgraded and you can skip the rest of these steps.
2. 

This is where I hit problems as I do not get the above options instead I am seeing this:

The Rambling Pages

–Hide–Always show

58 Posts, last published on 12-Aug-2011 –View Blog

New Post

–Edit Posts–Comments–Settings–Design–Monetise–Stats

I have tried to follow the below using Design instead but it doesn't work.  HELP PLEASE!!  Any ideas?????????

1. On the Template page you should see the standard window of HTML code. Now look in the navigation links for the tab that says Customize Your Design and click it.
2. 
3. You'll get a message explaining that Blogger will make a backup of your current template and replace it with an upgraded one. The backup will be made available indefinitely, so you can revert back to it later if you need to. Click the Upgrade Your Template button to continue.
4. 
5. Choose one of our default template designs. You'll be able to modify it all you want, once you pick one of these as the starting point. Click Save Template when you've made your choice.
6. 

Now you're all set. You'll end up on the new Page Elements tab, where you can start arranging things however you like. If you want to know more about using these new features before you dive in, you can read about them here: Layout Guide and Fonts & Colors. Have fun!