You need to add/change what is in the "Flickr Feed" field in your account's "Personal Information".

If you have been using Flickr on here, what is probably there now looks something like this:
http://api.flickr.com/services/feeds/photos_public.gne?id=1234567@N00&lang=en-us&format=rss_200

YOU NEED TO CHANGE THIS TO SOMETHING DIFFERENT.
All that is now needed in the "Flickr Feed" field is your actual Flickr ID.
This is an actual ID code—NOT your Flickr name.

Your ID will look something like this: "1234567@N00"

If you need help finding your Flickr ID, you can use the following website to figure it out:

http://idgettr.com

NOTE: If you use Flickr here, and you do not make this change, Flickr will no longer work for you on this website. If you want to start using Flickr here, add your Flickr ID as directed above, and your photostream will appear on your profile page. See mine, for an example.