Copy (Ctrl+C) & Paste below link at wherever you want :
Replace with your blog id at "YOUR-BLOG-ID".
Find your blog ID.
First login your blogspot > Layout > Page Elements.
Look at your browser's address bar, and you'll see something like this:
Copy the number after blogID=. That's your blog ID.
Now you've know your blog id and you can use it when you need it. :)