I can't login with my open ID

I am trying to log in to blogger with open ID. I get the message:

“WordPress.com
You need to sign in
You need to sign in to wordpress.com to complete this process.

You should use a bookmark or type in the address to do this. This page does not contain any links, to protect you from phishing.”

I’ve read advice that I should be logged in to my website in the same browser window. However on the website I am trying to comment on, the comment form pops up in its own little box so I can’t do that. I’ve tried to copy and paste the url from the litle box so that it is in the same window, but to no avail.

Please help. 🙁