The RPC URL is the URL of your site plus /RPC2
.
For instance, if your site is at http://mysite.editthispage.com/
, then the RPC URL is: http://mysite.editthispage.com/RPC2
The Blog ID is the URL of the site, including http://
and trailing slash.
So, using the example above, your Blog ID would be: http://mysite.editthispage.com/