The problem is that you are unable to accept the invitation from your seaholm e-mail. You need to send the invitation to your personal e-mail and, from there, you will be able to accept the invitation. The cool part is that you don't have to give me a different e-mail address!
1. Open the invitation from your e-mail.
2. Send this e-mail to your personal e-mail.
3. Follow the directions for the blog.