Follow the instructions on screen, and you should be able to merge your accounts.
Please note that merging your Launchpad accounts is very likely to break your access to Summit, AskUbuntu, any apps you have purchased in Software Center, and any third-party sites which use your Launchpad username as your login."
And yet another miserable failure. one sec...
Fortunately I am logged on to launchpad on other installs .. so all is not lost .. until I either get bumped or accidently close my browser ! LOL