How to manage which library is synced?

I currently have a library “A” synced with my online account. Now I have created a new library “B” that I want to sync in stead of “A” - how/where can I change which library is synced?

Thanks!

duplicate posting

http://community.thomsonreuters.com/t5/EndNote-How-To/How-to-manage-which-library-is-synced/m-p/131388#M23922