What is wrong with the message? It just lets you know that you are already subscribed to this list and if you want to update your profile you'll have to click the link... This is a security measure. Clicking the link will send you a mail, in the mail you get a link to click on. This confirms that you are the real person who has signed up for this list and then you can update your settings for the list.
Error loading feed data - is nothing important. Your server can't handle https urls and it cannot load our blog feed. Nothing to worry about.
Regards,
Daniel