Take the monorail to the MK and catch a bus to BC/YC. Or take the bus to Disney Studio's and take the Friendship boat or walk to BC/YC. If you walk, it takes around 25 minutes.
1. Take the bus to DHS, then walk or boat to the Yacht Club. 2. take monorail to Epcot, walk through to the international gateway, then walk or boat to YC. 3. Longer way but it will work, bus to DTD, then bus to YC.
The fastest, most direct route is a taxi. It will cost less than $20 including tip.