Note: Each individual Photo to be pinned must be set as Public. I have over 1,500 photos on flickr so even though I will try to get at least one photo from each of the recipes on my blog changed over it will take me awhile & I will probably miss some.
If you run into a post you want to pin & you can't let me know in the post comment & I will try to go in & get that photo set to public the next time I'm on blogger.
I'm listing the settings I changed in case others are trying to figure this out & in case I need to make changes again - If this doesn't work for you there may be additional settings that need to be changed - the nuances of Flickr are a bit overwhelming to me. Be certain you understand the repercussions of changing any setting before you do it. I'm only reporting what I changed I'm not qualified to explain Flickr settings.
It seems the settings in question were:
1) Under Account/ Privacy & Permissions / Hide Your Stuff From Public Searches - (uncheck) Hide your photos from searches on 3rd party sites that use the Api...
2) Under Account/ Privacy & Permissions / Allow others to share your stuff / (check) Yes, that would be lovely.
3) Each Photo that will be allowed to be pinned must have its owner settings set to / Anyone can see this photo
Sorry for any inconvenience caused by not being able to pin. I had almost given up blogging over this issue because with a recipe site, I understand that posts NEED to be pinable!