I signed up to Flickr using my Google account. This has become a major usability headache since I moved to China: While Flickr itself is not blocked here, Google's authentication redirect dance (which lately even includes YouTube) very often requires a VPN. In addition to that, Yahoo's login page dropped the Facebook and Google login options for users located in China. They still work, but you have to play with the URL to override geolocation with another locale.
How can I associate another login method to my existing Flickr account?
I am willing to create a Yahoo account for this purpose.